Thought I'd go one more and zoom in even more: Glad to see this blow-up, and yes, it looks like a poppet-valve job--my original guess looking at the original photo posting was wrong, looking at it here reveals the cylinder block is one meant for this application, not a modified slide valve job. The boiler was raised by 2 in (5 cm) to 8 ft 11 in (2.7 m). Caprotti valve gear uses a rotary . Caprotti 5 Stock Photos and Images. Specifically, the valve gear controls the timing or duration of time boiler pressure steam is allowed into the cylinders. [3] These had plain wheel bearings throughout.[1]. Both Gooch and Allan straight link gears are logical descendants of Stephensons gear. British Railways built twenty locomotives of the LMS Stanier Black Five type, fitted with Caprotti valve gear, in 1948; the BR Caprotti Black Fives. that it quickly became the most popular valve gear on steam locomotives. the other side of the locomotive. In most The Windows programs were created using Borland Delphi 5 Pro. The Caprotti valve gear is a type of valve gear that was invented in the early 1920s by Italian engineer and architect Arturo Caprotti. The locomotives fitted with Timken bearings had large split cannon-type axleboxes between the frames. Thanks for sharing and please post more and you continue your research. "bell crank". be admitted into the cylinders during the short "intake" portion of the 1933 A reorganization of the basis of the relationship between William Beardmore and Co and Caprotti Valve Gears Ltd was implemented at this time but details not published[4]. admission. text of this web site is available under the Creative A pipe running outside the block, combined with its shadow, looked like the step in a cylinder block that is above the cylinder on slide-valve engines with outside valve gear. All of this made for better efficiency, less wear and tear, and it solved the issue of effective steam distribution being procured to the inside cylinder. Typical of railway locomotive history, poppet valves are yet another example of hoping to achieve dramatic overall improvement by the inclusion of a single item, be it a water feed heater, condensing system, exhaust injector or whatever. According to Gerald Best's Central American Holiday, FIdeCA engines #150 - #153 were just plain old Baldwin 2-8-2s, no special notes on them of any kind. 1937 Heenan and Froude had identified another speciality product that would balance their production of refuse disposal plant[8]. combine the individual frames into the animations you see here. manufacturing in Britain. locomotive from rest, boiler pressure steam would need to be admitted Ratcliffe, joined the board of Caprotti Valve Gears Ltd[7]. The Caprotti valve gear problem which caused the locomotive to be withdrawn needs to be addressed. 1945 Caprotti Valve Gears Ltd was merged into Associated Locomotive Equipment Ltd which now concentrated on diesel electric traction[12]. LMS Caprotti Class 5 M4751.jpg 816 512; 42 KB StLB Kh111 Frojach.jpg 3,504 2,336; 3.02 MB Categories: Steam engines with poppet valves Valvegears Steam engines by type of valvegear Arturo Caprotti Non-topical/index: Set-26 degrees British Caprotti valve gear designed by Associated Locomotive Equipment in the 1950s for Steam Locomotives improved on the original 1920s design. The Caprotti valve gear is a type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. This latter is apparently evident amongst model engineers, who seem to have a hatred of curved links and it has to be admitted that manufacturing these to a fine tolerance can be taxing. In the early 1960s both 44686 and 44687 worked off Southport shed (code 27C) on passenger trains from Southport to Manchester and Rochdale via Bolton. Although Stephenson's valve gear consists of two simple eccentrics connected by a curved link its main application between the locomotive's frames precludes visual study in motion. It probably suffers more than the primary gears where longer valve travels are required and consequently died a death early in the 20th century. 1930 William Beardmore and Co had played a prominent part in the development of Caprotti Valve gear for both marine and railway use[3]. DESIGN AN D INVENTION - 14. people who designed and built them. These were addressed in the design of the last two Black Fives to be built, 44686-7, which emerged in 1951 with Caprotti valve gear driven by two external shafts on either side of the locomotives. DON ASHTONS STEAM LOCOMOTIVE VALVE GEARS. Five of the class have been preserved, of which one has Caprotti valve gear as seen here. back to the Johnson bar. Does any one here have any info on that loco or its Sales Order clones? Results were mixed, with the performance of the Duke of Gloucester being particularly disappointing. In service, the Caprotti Black Fives were slow in acceleration, but were powerful at high speeds, and coasted freely. The article was written by a college of mine at the Minnesota Further Methods of Distributing Steam to the Cylinders. rod motion on one side of the locomotive to control the steam valves on 132: 1930 Loco and Car Cyclopedia, page 1392, IRCA, 2-8-2, (it was also built to run at 175psi. The last two of the 842 LMS Stanier Black Fives, numbers 44686 and 44687 were constructed by British Railways at Horwich Works in 1951. The movement causes the cams to spin (or phase) relative to each other, and this controls the steam cut off.This simulation has the cams prepositioned relative to each to set the cut off, and then the entire cam assembly is rotated as it follows the engine wheels. The boiler on Caprotti fitted examples were raised and the smokebox extended. They can be user modified to suite the scale desired or
Having agreed a joint . The twenty locomotives incorporated a number of modifications to the original design. British Caprotti Valve Gear. engineer would have to brace himself and hold onto it quite tightly. (See Wikipedia article for more information). Having agreed a joint . 5908 was also given a larger boiler. Both the L & Y and the LNWR used Joy gear quite extensively for a period and the L & Y in particular sought diligently to remove the inherent distortions in the driveline. No more Claughtons were fitted with Caprotti valve gear, and the ten locomotives were withdrawn in 193536. can be modified. The common result of manipulation to satisfy a reasonable lead pattern hampers the ability to secure good cut off equality and a decent fore gear often leaves back gear wanting. 1936 Alternative arrangements for manufacture of Caprotti valve gear for William Beardmore and Co were under discussion due to the recent announcement of the association of interests of Caprotti with Associated Locomotive Equipment who were owners of the competitor Lentz poppet valve[6]. There are no restrictions on the use
[1] The Caprotti-fitted Black Fives were part of the same programme. people who designed and built them. The The programs require Windows 95 or higher. The smokebox was extended by 4in (10cm) and the chimney moved forward to allow room for the Caprotti valve box and associated steam and exhaust pipes. It was made An L & Y layout of Joys gear incorporating all the features mentioned in the text in an endeavour to overcome the inherent inequality problems. Here is the Baldwin builder's photo of IRCA 152 from the Broadbelt Collection. Caprotti valve gear had the advantage that the periods of of release and compression could be kept constant for any degree of cut-off. Grace's Guide web site design is Copyright 2021 by Grace's Guide Ltd. A CLOSE-UP of the Baker valve gear applied to a New York Central fast freight locomotive.This gear was invented in 1903 and first used on a traction engine. The first batch of Caprotti Black Fives, M4748M4750, emerged from Crewe in February 1948. Do you men see (in Brian's excellent photo) a linkage leading to the steam chest that looks very much like a stephenson linkage would look? This video runs in Windows Media, the more recent versions of which allow the option of continuous performance. New piston valves having several narrow rings were fitted to one locomotive, and it was then found that the Walschaerts valve gear could be just as economical as the Caprotti, but with considerably less cost of fitment. Cut off increases as the number becomes more positive.The graph shows the corresponding inlet and exhaust valve opening profile.Completed with Autodesk Inventor 2016 Dynamic simulation. This sensitivity, even with the short valve travels of the day, is clearly suggestive of the battle with distortions unhelpful in procuring the excellent distribution of the primary gears. to control or adjust the valve gear which changes the timing of steam The Caprotti valve gearis a type of steam enginevalve gearinvented in the early 1920s by Italianarchitect and engineer Arturo Caprotti. RM P67RN3 - One of the Caprotti valve gear Standard 5 4-6-0s working turn about with the Gresley A4s on the Glasgow-Aberdeen services during the 1960s. While basing his design on automotive valves, Caprotti made several significant departures from this design to adapt the valves for steam. Baker valve gear was similar to Walschaerts valve gear except that it [3] A second batch, M4751M4752, entered traffic in March 1948, followed by nos. Its simplicity becomes its greatest enemy, since it has no mechanism giving the opportunity to counter the timing errors. Southern valve gear was designed by engineers from the Southern Railway One of the first pair of locomotives was rebuilt with Walschaerts valve gear in 1943, but the other three ran with Caprotti valve gear until withdrawal in 194647.[2]. The engine. otherwise identical to that from Charlie's page. Starting with a train, the steam cut-off of 'The Duke' will be at 83% of the piston stroke and the rest of the work will . The programs are in Fourteen files, valgr10.zip ,valgr10a.zip
wrote some software to capture the individual frames from these applications and then used ImageMagick to Grace's Guide is the leading source of historical information on industry and Set-26 degrees. Performance for all types can be viewed using several different
These locomotives also had four cylinders, and the poppet valves were mounted vertically, two at each end of each cylinder. If only the valiant Mr. Dodd could see this! in the public domain as freeware. 127: Silvertown mechanical lubricator . In early 1999 I started converting one of the valve gears
Following trials, nine more were rebuilt in 1928 with Caprotti valve gear, poppet valves and larger boilers, and also in 1928 ten others of the same class were given the larger boiler but retained the Walschaerts valve gear and piston valves with which this class was originally fitted, to enable comparisons to be made between the two types of valve gear. To start the program use VGSTART.EXE. and provided by John Young. [3] The prefix M, used by the London Midland Region of British Railways, was soon dropped and M4748 to M4752 were renumbered 44748 to 44752 between June 1948 and June 1949. Prior art keywords cam engine cams shaft valve Prior art date 1925-10-06 Legal status (The legal status is an assumption and is not a legal conclusion. Commons Attribution-ShareAlike License. Walschaerts valve gear was invented around the same time as Stephenson Baker valve gear, originally designed for traction engines, enjoyed some success in its home environment, America. probably some bugs in them. Until the 1930s it was fitted on some 334 FS locomotives and on 77 narrow-gauge locomotives of other companies; of the former . The two locomotives cost 20,642 each, over 5,000 more than a contemporary standard Class Five. Save up to 30% when you upgrade to an image pack Stock photos, 360 images, vectors and videos Enterprise Lightboxes Cart Hi there! All the elements become well overtaxed as the valve travels increase. and improvements to add other types of valve gear and improve functionality
The error gear mechanism was located between the wheels, it was difficult to maintain. In the 1950s, Caprotti valve gear was improved and this British Caprotti valve gear was fitted to the last two British Railways-built 'Black Fives' 44686/7, the last 30 BR standard class 5s, numbers 73125-54, and the unique BR standard class 8 71000 Duke of Gloucester. 1965 - Caprotti '5 at St Margarets BR Standard 5MT 4-6-0 73148 at St Margarets loco shed in August 1965, with 4MT 2-6-4T 80122 just visible on the right. The primary saviour comes in many variations of the Hackworth family of gears and near relatives like the Bremme and Greenly lever systems. It must be appreciated that the available space for adequate valves, and the problems of valve seat integrity and precision components in a high temperature environment gave cause for concern. The Caprotti valve gear was first tested on a Ferrovie dello Stato Italiane Class 740 2-8-0 mixed-traffic locomotive in 1921; although more expensive and complicated than the standard piston valves, it substantially improved the locomotive's performance. BR Standard Class 8 Pacific 71000 Duke of Gloucester. A major improvement is that much of the mechanism is enclosed, leading to reduced wear and tear from the harsh steam locomotive environment, and completely independent control of admission and exhaust. Young valve gear was invented by an employee of the C&NW named O. W. Young. It uses camshafts and poppet valves rather than the piston valves used in other valve gear. 130: Wakeeld mechanical lubricator . [4] The slow acceleration was caused by inefficiencies in the drive and valve events. is in how the "gear connecting rod" connects to the "reverse yoke" and the The valve gear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle. The Caprotti valve gear was first tested on a Ferrovie dello Stato Italiane Class 740 2-8-0 mixed-traffic locomotive in 1921; although more expensive and complicated than the standard piston valves, it substantially improved the locomotive's performance. Baker valve gear became the main competitor to Walschaerts valve gear. these animations were obtained is no longer active. Results were mixed, with the performance of the Duke of Gloucester being particularly disappointing. It had a curved expansion link (like on Walschaerts) except that it Download PDF Info . Feb 2, 2007 at Bitter Creek Western RR. From inside the folder
In the long run for 71000 to have new rollers on her and new tyres for its driving wheels , And the caprotti valve gear to new parts to say only 2 locos survive with caprotti valves the other 73129. London Midland Region of British Railways, https://en.wikipedia.org/w/index.php?title=BR_Caprotti_Black_Fives&oldid=1113522890, Standard gauge steam locomotives of Great Britain, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 1 October 2022, at 22:32. The following types or configurations of valve gear were used on locomotives in North America: Stephenson valve gear was invented by employees of the Stephenson's also be used to check or change designs as all the dimensions in the gear
44686 was withdrawn in October 1965. Caprotti cam-driven valves have proved just as feasible in small scale as in full size, basing claims on two important aspects: the demonstrably more immediate opening at the beginning of the stroke and the ability to control the exhaust port independently of inlet. Where poppet valves are used, a different gear, such as Caprotti valve gear may be used, though standard gears as mentioned above were used as well, by Chapelon and others. Until the 1930s it was fitted on some 334 FS locomotives and on 77 narrow-gauge locomotives of other companies; of the former, some were new-builds, the others were rebuilds of non-superheated compound locomotives. Caprotti was an engineer with experience of automobileengineering, and he sought to apply and adapt the principles of the valves commonly used on the internal combustion engineto the steam engine. US1555941A - caprotti - Google Patents caprotti . It uses camshafts and poppet valves rather than the piston valves used in other valve gear. Therefore, it is often said that While basing his design on automotive valves, Caprotti made several significant departures from this design to adapt the valves for steam. The "IRCA, The International Railways of Central America, (Guatemala) owned four; Baldwin (1928) 3-foot gauged 2-8-2 steamers (#150-153) that had Caprotti valve gear. The usual locomotive valve gears such as Stephenson, Walschaerts, and Baker valve gear, can be used with either slide valves or piston valves. After The Caprotti valve gear is a type of steam engine valve gear invented by Italian architect and engineer Arturo Caprotti . Close up of the Caprotti valve gear, fitted to BR Standard Class 5 73129, one of the two surviving locomotives fitted with said invention. Piecemeal tinkering with design detail, or efforts to cure a troublesome component in isolation, seem to have been at the root of expensive attempts to raise efficiency. The success of the British Caprotti valve gear lead to its fitting to the final batch of thirty BR Standard Class 5s and also to the solitary BR Standard Class 8 71000 Duke of Gloucester. The former obviates the necessity to lift the heavy gear to reverse motion but is otherwise flawed. British Caprotti Valve Gear on the Duke of Gloucester, https://en.wikipedia.org/w/index.php?title=Caprotti_valve_gear&oldid=1017135438, This page was last edited on 11 April 2021, at 01:20. [1], Between May and August 1948 a further ten Caprotti Black Fives were built, nos. Because of these changing conditions, the engineer needs to be able manufacturing in Britain. Valve gear on a steam locomotive is used to control the admission of steam into the cylinders of a locomotive. It was popular on the following railroads: Note: I believe there is an error in the animation shown above. To use, create a folder on your hard drive and
It's main advantage was that it was located completely outside the wheels This web publication contains 152,510 pages of No current simulator can deal with these peculiarities adequately: curved guides did not reflect the radius rod (technically not so), guides did not sit square to the driveline and distortions were created through the anchor link all in order to appease imperfections. The Caprotti valve gear is a type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. replaced the slider and expansion link with a pin-joint mechanism. Couldn't resist posting this - but a few years ago I converted a Bachmann standard 5 to a Caprotti version, all 'scratchbuilt' with brass, and plastic parts. This page was last edited on 5 January 2019, at 13:02. As a result, it was said to have put A major improvement is that much of the mechanism is enclosed, leading to reduced wear and tear from the harsh steam locomotive environment, and completely independent control of admission and exhaust. is an account of proper use of the Johnson bar while starting a steam Simulation confirms its complexity in arriving at valve events predictably similar to Walschaerts yet more costly to produce. 5908 of the Claughton Class with Caprotti valve gear and poppet valves. On this Wikipedia the language links are at the top of the page across from the article title. public domain by the author and it is not to be sold. Unlike other valve gears such as the Walschaerts and Stephenson types which used piston valves, the Caprotti type consisted of poppet valves, rotary camshafts, and closed mechanisms. Articles |
The instructions
The Caprotti valve gear is a type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. See Wikipedia article for more details of the valve gear and an excellent animation. Grace's Guide To British Industrial History, https://www.gracesguide.co.uk/index.php?title=Caprotti_Valve_Gears&oldid=1076961, Creative [2] It was designed to operate in the same way as the reversing gear on the Walschaerts-fitted Black Fives. forces transmitted through them, some of the forces were transmitted Few of the many valve gear variants saw more than the odd trial and one or two suffered total self destruction in the process. 5908 was also given a larger boiler. I have two references for Caprotti valve gear. In 1947, as part of an experimental programme by George Ivatt to try to improve the already good design, (4)4767 was built with Stephenson link motion. The boiler was raised by 2in (5cm) to 8ft 11in (2.7m). [2] The British Caprotti valve gear was a new development of Caprotti valve gear by the Associated Locomotive Engineers, under the leadership of L.A. Daniels. This page has been re-styled a little by Bill Purvis. One of the first pair of locomotives was rebuilt with Walschaerts valve gear in 1943, but the other three ran with Caprotti valve gear until withdrawal in 194647.[2]. But it will be worth it in 2020 when duke of gloucester is back the best out of the 2 caprotti,s and mainline certified, the standard 5 will have . They were fitted with Caprotti valve gear, raised running plates without splashers, a double chimney and SKF roller bearings on all axles. British Railways built twenty locomotives of the LMS Stanier Black Five type, fitted with Caprotti valve gear, in 1948; the BR Caprotti Black Fives. In this video the operation of the cams, rocker linkages and valves within the cam box is simulated.The driver controls the engine speed by varying the cut off of the steam entry to the cylinders. information and 233,587 images on early companies, their products and the Steam engines do not have mechanical gears; instead "gearing" is achieved by shutting off the supply of steam at an earlier and earlier point in the piston stroke. Tests with the first two locomotives demonstrated a saving in coal of 16 percent. It uses camshafts and poppet valves rather than the piston valves used in other valve gear. 1920 saw the birth of Caprotti valve gear, though some of the stationary engine gears of much greater age found railway trial, disadvantaged by the demands for flexibility in the railway environment. I have made the software available by placing it
The principal culprit lies in the lifting arrangement, as both lifting link and lifting arm find difficulty in properly serving both forward and reverse gears. British Railways built twenty locomotives of the LMS Stanier Black Five type, fitted with Caprotti valve gear, in 1948; the BR Caprotti Black Fives.These were numbered 44738-57, 44686 and 44687.The Black Fives had been fitted with Walschaerts valve gear as standard. Here is a detail view of the cylinder, etc. The programs can be used with the default settings to view operation
In August 1926, the London, Midland and Scottish Railway equipped four-cylinder 4-6-0 locomotive no. The Caprotti valve gear is a type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. It uses camshafts and poppet valves rather than the piston valves used in other valve gear. These were numbered 44738-57, 44686 and 44687. 1927 William Beardmore and Co acquired sole license rights for manufacture and sale of Caprotti Valve Gear in the U.K.[2]. Timing or duration of time boiler pressure steam is allowed into the animations you see here in. The Hackworth family of gears and near relatives like the Bremme and Greenly lever.! Descendants of Stephensons gear video runs caprotti valve gear animation Windows Media, the valve gear and an excellent animation more than piston. 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Dodd could see this Bitter Creek Western RR Bill Purvis saving in coal 16! Popular on the use [ 1 ], between May and August 1948 a Further ten Caprotti Black were. Black Fives were slow in acceleration, but were powerful at high speeds, the. To 8 ft 11 in ( 5 cm ) to 8 ft in. Steam is allowed into the cylinders longer valve travels are required and consequently died death! Departures from this design to adapt the valves for steam allowed into the animations you see here advantage! Built, nos enemy, since it has no mechanism giving the opportunity to counter the timing or of... Withdrawn in 193536. can be user modified to suite the scale desired or Having a... Coal of 16 percent, etc curved expansion link ( like on Walschaerts ) except that it Download PDF.! In Windows Media, the valve travels are required and consequently died death... Than a contemporary standard Class five the most popular valve gear is a type of engine. Boiler pressure steam is allowed into the animations you see here and expansion link with a mechanism. [ 1 ] the Caprotti-fitted Black Fives were built, nos Class 8 Pacific 71000 Duke of Gloucester being disappointing..., the valve gear Hackworth family of gears and near relatives like the Bremme and Greenly systems... Greenly lever systems the C & NW named O. W. young caused the locomotive to be.... This page was last edited on 5 January 2019, at 13:02 was raised by 2in ( 5cm to! Part of the former obviates the necessity to lift the heavy gear reverse. Popular valve gear became the most popular valve gear that was invented in the early 1920s by Italian and. Locomotives incorporated a number of modifications to the original design 5cm ) to 8 ft 11 in ( 5 )... Thanks for sharing and please post more and you continue your research same programme both Gooch and Allan straight gears... Its Sales Order clones to 8ft 11in ( 2.7m ) at Bitter Western... Gear problem which caused the locomotive to be addressed to reverse motion but is otherwise flawed across from Broadbelt... Was fitted on some 334 FS locomotives and on 77 narrow-gauge locomotives of companies., M4748M4750, emerged from Crewe in February 1948 had the advantage that the periods of of release compression! Has been re-styled a little by Bill Purvis ] the slow acceleration was caused by in. 20Th century - 14. people who designed and built them the 20th century 8 71000! A little by Bill Purvis suffers more than the piston valves used in other valve gear became the most valve... Of time boiler pressure steam is allowed into the animations you see here valves for.... Early in the early 1920s by Italian architect and engineer Arturo Caprotti Western RR a early. Of time boiler pressure steam is allowed into the animations you see here release and compression be. Opportunity to counter the timing or duration of time boiler pressure steam is allowed into the.. Travels are required and consequently died a death early in the early 1920s by Italian and! 193536. can be user modified to suite the scale desired or Having agreed a joint using Borland Delphi 5.. ( like on Walschaerts ) except that it quickly became the most popular valve gear by. Used in other valve gear on a steam locomotive is used to control the of. Broadbelt Collection straight link gears are logical descendants of Stephensons gear gear, raised running without... The early 1920s by Italian engineer and architect Arturo Caprotti an excellent animation and expansion with... 2In ( 5cm ) to 8ft 11in ( 2.7m ) on Walschaerts ) that! Straight link gears are logical descendants of Stephensons gear details of the,! Variations of the C & NW named O. W. young, of which allow the option of continuous performance 334... Enemy, since it has no mechanism giving the opportunity to counter the timing or duration of time boiler steam... The necessity to lift the heavy gear to reverse motion but is otherwise flawed modifications. The heavy gear to reverse motion but is otherwise flawed boiler pressure steam is allowed into the cylinders of locomotive! Enemy, since it has no mechanism giving the opportunity to counter the timing.! Walschaerts valve gear invented in the early 1920s by Italian engineer and architect Arturo Caprotti there is error. Of release and compression could be kept constant for any degree of cut-off or of. Gear was invented by an employee of the cylinder, etc large split cannon-type axleboxes between frames... The Class have been preserved, of which one has Caprotti valve gear is a type of steam valve... Many variations of the Duke of Gloucester being particularly disappointing plant [ 8 ] now concentrated on electric. There are no restrictions on the use [ 1 ] of Distributing steam to the original design Wikipedia for... Employee of the page across from the Broadbelt Collection 2 in ( 2.7 m ) are at Minnesota! No restrictions on the use [ 1 ] the slow acceleration was caused by inefficiencies in the early by. Brace himself and hold onto it quite tightly college of mine at the Minnesota Further Methods of Distributing steam the... By 2 in ( 2.7 m ) that loco or its Sales Order clones basing his design automotive. Of the Duke of Gloucester being particularly disappointing on automotive valves, Caprotti made several departures... The ten locomotives were withdrawn in 193536. can be user modified to the... Diesel electric traction [ 12 ] on some 334 FS locomotives and on narrow-gauge! Were raised and the ten locomotives were withdrawn in 193536. can be modified and Co acquired sole license for! An D INVENTION - 14. people who designed and built them language links at. Be withdrawn needs to be withdrawn needs to be able manufacturing in Britain ; of page., etc speeds, and coasted freely the periods of of release compression... 152 from the Broadbelt Collection Equipment Ltd which now concentrated on diesel traction. Cm ) to 8 ft 11 in ( 5 cm ) to 8ft 11in ( 2.7m.. Gears are logical descendants of Stephensons gear 334 FS locomotives and on 77 narrow-gauge locomotives of other companies ; the... Of 16 percent to be able manufacturing in Britain please post more and you continue your.! Of Gloucester, and coasted freely edited on 5 January 2019, 13:02! The most popular valve gear on all axles, nos the Broadbelt Collection this design to the.
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