| BR Standard Class 3 2-6-0 | |
|---|---|
| BR Standard Class 3 2-6-0 77000 at Darlington Works on 22 March 1959. This locomotive was then currently allocated to Hull (Springhead) MPD (shed code 53C). | |
| Power type | Steam |
| Designer | Robert Riddles |
| Builder | BR Swindon Works |
| Build date | February – September 1954 |
| Total produced | 20 |
| Configuration | 2-6-0 |
| UIC classification | 1'Ch |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading wheel diameter |
3 ft 0 in (0.914 m) |
| Driver diameter | 5 ft 3 in (1.600 m) |
| Length | 55 ft 11 1⁄4 in (17.05 m) |
| Width | 8 ft 5 5⁄8 in (2.58 m) |
| Height | 13 ft 0 in (3.96 m) |
| Axle load | 16.25 long tons (16.51 t) |
| Weight on drivers | 48.50 long tons (49.28 t) |
| Locomotive weight | 57.50 long tons (58.42 t) |
| Tender weight | 42.15 long tons (42.83 t) |
| Tender type | BR2A |
| Fuel type | Coal |
| Fuel capacity | 6.00 long tons (6.10 t) |
| Water capacity | 3,500 imp gal (16,000 l; 4,200 US gal) |
| Boiler | BR6 |
| Boiler pressure | 200 psi (1.38 MPa) |
| Firegrate area | 20.35 sq ft (1.891 m2) |
| Heating surface: Tubes and flues |
923.54 sq ft (85.800 m2) |
| Heating surface: Firebox |
118.42 sq ft (11.002 m2) |
| Superheater area | 184.50 sq ft (17.141 m2) |
| Cylinders | Two, outside |
| Cylinder size | 17.5 × 26 in (445 × 660 mm) |
| Tractive effort | 21,490 lbf (95.6 kN) |
| Factor of adhesion |
5.05 |
| Career | British Railways |
| Power class | 3MT |
| Number | 77000–77019 |
| Axle load class | Route availability 4 |
| Withdrawn | 1965–1967 |
| Disposition | All scrapped |
The BR Standard Class 3 2-6-0 was a class of mixed traffic steam locomotive designed by Robert Riddles for British Railways. It was essentially a hybrid design, the chassis being closely based on and sharing a number of parts with the LMS Ivatt Class 4, and having a boiler derived from a GWR No.2 boiler as fitted to the GWR Large Prairie 2-6-2T and 5600 Class 0-6-2T tank engines.
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The design and construction took place at the ex-GWR Swindon Works, along with the 2-6-2T tank engine version of the class. Although the boiler shared flanged plates with the GWR No.2 boiler the barrel was shortened by 5 13⁄16 inches and a dome added. Strangely the class did not share the same design of wheels as the Doncaster-designed BR Standard Class 4 2-6-0 (76XXX), which also had 5 ft 3 in (1,600 mm) driving wheels and the same piston stoke, and hence crank-pin throw.
In common with a number of the other BR Standard Classes, the chassis design used a number of LMS-designed components including Brake Hanger Brackets, Flexible Stretcher Brackets and Reversing Shaft Brackets.
The cylinder covers of engines as built were fitted with "screw-in" type pressure relief valves. From September 1955 revised cylinder covers were introduced for renewals incorporating "bolt-on" type pressure relief valves.[1]
Although the chassis had many almost identical parts to the LMS Ivatt Class 4 the motion brackets were derived from the design of those fitted to the LMS Ivatt Class 2 2-6-0 and LMS Ivatt Class 2 2-6-2T.
Unlike a number of the larger BR Standards the exhaust steam manifold within the smokebox saddle was a steel fabrication that was part of the welded saddle[2]. In a number of the large BR standards (BR Standard Class 6 and Class 7 engines) the exhaust steam manifold was a steel casting welded into the saddle during manufacture[3].
Only 20 were built, numbers 77000–77019, all at Swindon Works. Their operations were mainly restricted to the North Eastern and Scottish Regions, of British Railways, though 77014 was transferred to the Southern Region late in its life. Due to their small number, the class were the antithesis of 'standard' engines and it would probably have been better to build more 2-6-0s to the Standard Class 4 and Standard Class 2 designs instead. None has survived to preservation, though some components were saved from scrapyards for use on a project to build a new Standard Class 3 2-6-2T.
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