BR standard class 4 4-6-0

BR standard class 4 4-6-0

Infobox Locomotive
powertype=Steam
name = BR standard class 4 4-6-0


caption = 75020 on an up local at Tywyn on 25 July 1961. The standard 4s were closely associated with the Cambrian Line.
designer = R. A. Riddles
builder = British Railways
builddate = 1951
totalproduction = 80
whytetype = 4-6-0
gauge = 4' 8½"
leadingsize =
driversize = 5' 8"
length =
weight = 69 tons 0 cwt
fueltype = coal
fuelc

waterc

cylindercount = two outside
cylindersize = 18" x 28"
firearea =
boilerpressure = 225 psi
tractiveeffort = 25,100 lbf
railroadclass= 4MT| British Railways Standard Class 4 4-6-0 is a class of steam locomotives built during the 1950s. Six have been preserved.

Background

The class 4s were introduced in 1951 designed for mixed traffic use on secondary routes where the class 5s would be too heavy. It was 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.

Design work was done at Brighton by R. A. Riddles, with help from Swindon, Derby and Doncaster. Construction was at the BR Swindon works.

The engine weighs 69 tons, with tender weighing a further 42 tons. The engine is 50 ft long, with 5 ft 8 in diameter driving wheels. It carries 3500 imp gallons of water and 6 tons of coal to produce 25,500 lbf tractive effort. It has two cylinders of 18 inch diameter and 28 in stroke operated at maximum boiler pressure of 225 psi. British rail classification 4MT.

In service

The class was allocated to the London Midland Region, the Southern Region and the Western Region.

Preservation

Six members of the class have been saved from the cutter's torch. These are:-
*No.75014 at the Paignton and Dartmouth Steam Railway and under overhaul.
*No.75027 at the Bluebell Railway and currently stored awaiting overhaul.
*No.75029 at the North Yorkshire Moors Railway and is currently operational having had TWPS fitted to operate to Whitby.
*No.75069 awaiting restoration at the Severn Valley Railway
*No.75078 at the Keighley and Worth Valley Railway
*No.75079 at the Mid-Hants Railway and is under overhaul.

References

* "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

External links

* [http://www.semgonline.com/steam/std4-460_01.html Southern E-group photo gallery]
* [http://www.bluebell-railway.co.uk/bluebell/pics/75027.html Bluebell railway, engine 75027]


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