BR standard class 4 4-6-0
|BR standard class 4 4-6-0|
|Preserved Standard Class 4 4-6-0 No. 75027 on the Bluebell Railway|
|Designer||R. A. Riddles|
|Builder||BR Swindon Works|
|Build date||May 1951 – May 1957|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|3 ft 0 in (0.914 m)|
|Driver diameter||5 ft 8 in (1.727 m)|
|Length||60 ft 0 in (18.29 m)|
|Width||8 ft 9 1⁄2 in (2.68 m)|
|Height||13 ft 0 in (3.96 m)|
|Axle load||17.25 long tons (17.53 t)|
|Weight on drivers||51.55 long tons (52.38 t)|
|Locomotive weight||67.90 long tons (68.99 t)|
|Tender weight||BR1B: 49.15 long tons (49.94 t);
BR2/BR2A: 42.15 long tons (42.83 t)
|Tender type||BR1B (15), BR2 (50), BR2A (15)|
|Fuel capacity||BR1B: 7.00 long tons (7.11 t);
BR2/BR2A: 6.00 long tons (6.10 t)
|Water capacity||BR1B: 4,250 imp gal (19,300 l; 5,100 US gal);
BR2/BR2A: 3,500 imp gal (16,000 l; 4,200 US gal)
|Boiler pressure||225 psi (1.55 MPa)|
|Firegrate area||26.7 sq ft (2.48 m2)|
Tubes and flues
|1,301 sq ft (120.9 m2)|
|143 sq ft (13.3 m2)|
|Superheater area||258 sq ft (24.0 m2)|
|Cylinder size||18 in × 28 in (457 mm × 711 mm)|
|Tractive effort||25,515 lbf (113.5 kN)|
|Axle load class||BR1B: Route Availability 7
BR2/BR2A: Route Availability 4
|Withdrawn||October 1964 – August 1968|
|Disposition||6 preserved, remainder scrapped|
The class was introduced in 1951. They were designed for mixed traffic use on secondary routes where the otherwise ubiquitous BR standard class 5 and their predecessors, the Black Fives, would be too heavy. They were essentially a tender version of the standard 4 2-6-4T, with similar characteristics to the GWR Manor Class, though unlike the Manors they were built to the universal loading gauge. They used the same running gear as the tank engine (with the leading bogie from the Standard Class 5), and substantially the same firebox, smokebox and boiler, although the boiler barrel was increased in length by 9 inches (23 cm).
The engine weighed 67.90 long tons (68.99 t), was 60 ft 0 in (18.29 m) long, with 5 ft 8 in (1.727 m) diameter driving wheels. It had two cylinders of 18 inches (457 mm) diameter and 28 inches (711 mm) stroke operated at maximum boiler pressure of 225 lbf/in² (1.55 MPa), to produce 25,515 lbf (113.5 kN) tractive effort. Its British Railways power classification was 4MT.
It normally used the standard BR2 or BR2A tender, which weighed 42.15 long tons (42.83 t) and carried 3,500 imp gal (16,000 l; 4,200 US gal) of water and 6.00 long tons (6.10 t) of coal. In this configuration its route availability was 4, almost universal over the British Railways network.
The class was initially allocated to the London Midland Region (45) and the Western Region (20). The last 15 were allocated to the Southern Region. The Southern batch were built with BR1B tenders, which weighed 49.15 long tons (49.94 t), and carried 4,250 imp gal (19,300 l; 5,100 US gal) of water and 7.00 long tons (7.11 t) of coal. This reduced their route availability to 7, the same as the Standard Class 5.
Six members of the class have been saved from the cutter's torch. These are:-
- No.75014 at the Paignton and Dartmouth Steam Railway, currently under overhaul.
- No.75027 at the Bluebell Railway, currently stored awaiting overhaul.
- No.75029 at the North Yorkshire Moors Railway, In service, fitted with TPWS for Whitby Services
- No.75069 at the Severn Valley Railway, undergoing overhaul
- No.75078 at the Keighley and Worth Valley Railway, currently under overhaul.
- No.75079 at the Mid-Hants Railway, currently under restoration.
All but 75079 have worked in preservation at some point. Three of them (75014, 75029 and 75069) have worked on the main line. No. 75029 (presently under repair) is passed to work on the main line between Grosmont and Whitby.
Modelling↑Jump back a section
- A Detailed History of BR Standard Steam Locomotives, - Vol 2 - The 4-6-0 and 2-6-0 Classes. RCTS ISBN 0-901115-93-2
- Bradley, Rodger P. (1984). The Standard Steam Locomotives of British Railways. David & Charles Publishers plc.
- Southern E-group photo gallery
- 75027 webpage at the Bluebell Railway
- 75079 webpage at the Mid Hants Railway
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