George Jackson Churchward's final engine design prior to retirement in 1921 was this mixed-traffic 2-8-O with 5' 8" wheels. They were to prove to be outstanding performers and most imposing to watch at speed. For a detailed history of this long lived class, Part Nine of The Locomotives of the Great Western Railway published by the RCTS is essential reading. Other sources of information include: Railway World, January 1966, contains a very interesting article by R.C.Riley. An Article in the first edition of Great Western Railway Journal (Wild Swan). Great Western Eight Coupled Locomotives by David Maidment (Pen and Sword) An article in the HMRS Journal Vol 18, No.9 by Bob Miller
Cab roof. About 1927 the cab roofs were extended at the back.
Snifting valves. The position varied as indicated above.
Cab spectacle windows. These were plated over during the late 1920's.
ATC equipment. This was fitted to the entire class between 1/1930 and 7/1931.
Smokebox chin step. There are two different designs.
Lamp bracket. This was moved to the smokebox door in 1934-37.
Vacuum pipe. Originally this was tall but later a shorter pattern was introduced.
Pony truck spring housing. Originally uncovered but subsequently fitted with a bell shaped cover. .
When built the engines were paired with new (probably!) 3500 gallon tenders of standard Churchward design with visible, snap head rivets, on the tanks and coal plates. At least two (4704 & 4706) were subsequently fitted with Dean 4000 gallon tenders with flush rivets until all the class were paired with new Collett 4000 gallon tenders, which became standard for the class.
Pony truck wheels 3' 2" dia. 10 spokes, 5/32” axle, Slater Ref. 7838GMF
Driving wheels 5' 8" dia. 18 spokes, 3/16” axle, early version, Slater Ref. 7868GW
Motor/Gearbox. A Canon motor with a SDMP 40L/15 gearbox (available from Finney7) or an alternative such as an ABC VML2 gearbox.
Crankpins. Heavy duty crankpins are available from Finney7.
To obtain a pdf copy of the instructions please click on the links below; the pdf will open in a new window. Unfortunately the A4 and A3 pages have to be in different files.