BR standard class 3MT 2-6-0
| BR standard class 3MT 2-6-0 | |
|---|---|
 BR Standard Class 3 2-6-0 77000 in front of Darlington Works on March 22, 1959. This locomotive was then taken to Hull (Springhead) MPD (Shed 53C).
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| Numbering: | 77000-77019 |
| Number: | 20th |
| Manufacturer: | Swindon Works |
| Year of construction (s): | February - September 1954 |
| Retirement: | 1965-1967 |
| Axis formula : | 1'C |
| Type : | 1'C h2 |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 17,050 mm |
| Height: | 3,960 mm |
| Width: | 2,580 mm |
| Wheel set mass : | 16.51 t |
| Coupling wheel diameter: | 1,600 mm |
| Driving wheel diameter: | 1,600 mm |
| Impeller diameter front: | 914 mm |
| Number of cylinders: | 2 |
| Cylinder diameter: | 444 mm |
| Piston stroke: | 660 mm |
| Boiler : | BR6 |
| Grate area: | 1.891 m² |
| Radiant heating surface: | 11.002 m² |
| Tubular heating surface: | 85,800 m² |
| Superheater area : | 17.141 m² |
| Tender: | BR2A |
| Drive: | steam |
The BR standard class 3MT 2-6-0 was a mixed traffic steam locomotive designed by Robert Riddles for British Railways . The design is based on older types: the chassis was based closely on the LMS Ivatt Class 4 , from which some parts were taken. The boiler was derived from a GWR No. 2 boiler, similar to those in the tank locomotives GWR Large Prairie 2-6-2T and 5600 Class 0-6-2T .
construction
The BR standard class 3MT 2-6-0 - as well as the 2-6-2T tank locomotive version of this class - was designed and built in the Swindon Works of the former GWR (Great Western Railway). Like GWR no. 2-boiler flanged boiler plates, but the long-boiler to 5 was 13 / 16 -inch (147.64 mm) shorter and received an additional steam dome. Strangely, the class did not adopt the wheel design of the Doncaster-built BR standard class 4MT 2-6-0 (76XXX), which also had 5 ft 3 in (1,600 mm) drive wheels, the same piston stroke and thus the same crank diameter.
As with some of the other BR standard classes, components developed by the LMS (London, Midland and Scottish Railway) were used for the running gear , such as the brake hanger suspension, the flexible cross member suspension and the suspension of the reversing shaft.
The cylinder covers of the locomotives had screw-in pressure relief valves. From September 1955, revised cylinder covers with screw-on pressure relief valves were introduced as part of renovation work.
Many of the chassis components were virtually identical to those of the LMS Ivatt Class 4 . The design of the wheelset bearings, however, was derived from the design of the components of the LMS Ivatt Class 2 2-6-0 and LMS Ivatt Class 2 2-6-2T .
As can be seen from the original BR drawing SL / SW / 616, in contrast to a number of larger locomotives, the exhaust steam distributor of the BR standard class 3MT 2-6-0 within the smoke chamber was a welded steel construction. In some larger locomotives of the BR standard class 6MT and the BR standard class 7MT , however, the exhaust steam distributor was made of cast steel and was welded in place during manufacture.
Operating time
Only 20 pieces were built, numbers 77000-77019, all at the Swindon Works . Their use was mainly limited to the North Eastern Region and the Scottish Region of British Railways , but the 77014 was last used in the Southern Region . In view of the small number of units, the designation "standard class" was basically a contradiction and it would probably have been better to build more of the 1'C locomotives in the standard class 4 and standard class 2 design instead. No locomotive has survived, although some components could be saved from being scrapped. They are to be used for a project to build a new Standard Class 3 2-6-2T. This class was the last class of steam locomotives on British Railways, which remained complete until the first retirement. Number 77014 was moved from the Northwich depot in the London Midland Region to the Guildford depot in the Southern Region in March 1966 ; in July 1967 it was retired.
Construction of another locomotive of this class
No locomotive of this class has survived. The association "77021 Locomotive Group" was founded to fill this gap in the ranks of the existing BR standard locomotives. The group believes that the 3MT, with its relatively lightweight construction, would make an ideal museum locomotive.
The 77021 Locomotive Group anticipates that significant cost savings will be possible as many of the castings required can be made with molds owned by the British Railways Standard Locomotive Owners Group ( BRSLOG ) of which they are a member. Many of the castings are identical to those used to build a new 82045 locomotive.
Web links
literature
- Rodger P. Bradley: The Standard Steam Locomotives of British Railways . David & Charles Publishers plc, 1984.
- Paul J. Quirin, RK Taylor: A Detailed History of British Railways Standard Steam Locomotives: vol 3 Tank Engine Classes . Railway Correspondence and Travel Society (RCTS), 2007, ISBN 0-901115-77-0 .
Individual evidence
- ↑ Rear cylinder cover according to BR drawing SL / SW / 35, replaced by SL / SW / 666 and front cylinder cover according to drawing SL / SW / 85 replaced by SL / SW / 667 for renovation work from September 1955.
- ^ A b British Railways Standard Locomotives Swindon Drawings. (PDF) (No longer available online.) Archived from the original on September 13, 2014 ; Retrieved June 20, 2015 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Confirmed on the original BR drawing SL / DE / 19620 from the NRM (National Railway Museum)
- ^ Paul Teal: BR Motive Power Allocations 1959–1968 - 1: BR Standards & Austerities . Ian Allan , Shepperton 1985, ISBN 0-7110-1540-6 , p. 74.
- ↑ John Walford: Section 5.7.2 Allocation Summary . In: RK Taylor (Ed.): A Detailed History of British Railways Standard Steam Locomotives - Volume Two: The 4-6-0 and 2-6-0 Classes . RCTS , Peterborough 2003, ISBN 0-901115-93-2 , p. 226.
