Close up to show part of locomotive footplate


Finney7 SR 4-4-2 Adams Radial Tank Locomotive

The locomotives, which form the subject of this kit, were to the design of William Adams for the LSWR. They were a development of his ‘46’ class of 1878. A total of 71 locomotives were built at by four outside builders.
For a detailed history of this numerous class we suggest you refer to the following definitive books by the late D.L.Bradley:
Part two of The Locomotives of the LSWR published by the RCTS.
LSWR Locomotives - The Adams Classes published by Wild Swan.

Other valuable sources of information and photographs are:
A Pictorial Record of Southern Locomotives - J.H.Russell - OPC
Locomotives Illustrated No. 59 – LSWR Outside-cylinder Tank Locomotives - Ian Allan
Southern Steam Locomotive Survey - The Adams Classes - Bradford Barton
From Devon to Dorset: the Story of the Lyme Regis Branch by George Reeve
With such a large number of locomotives, built by four different builders, and lasting in service for over seventy five years, there are considerable variations between individual engines. Martin has attempted to cover many of these by including alternative components in the kit, however it is essential to have a photograph of the individual locomotive you propose to construct to enable an authentic model to be built.


Rivets.    In traditional Beyer,Peacock style the first ten engines were built using snap head rivets. The remaining engines were all built using mainly flush rivets on the running plate and above.
Tank length.  The first 28 locomotives had very short side tanks. Subsequent locomotives had longer tanks of increased capacity.
Blower valve.    The position of the blower valve varied depending on the builder. Late survivors had the blower valve moved, in Drummond style, to the side of the smokebox with the operating rod inside the handrail, which was lengthened for the purpose.
Dome.  Domes were of two sizes were fitted.
Trailing wheels.  The last twenty engines had the trailing wheel diameter increased to 3’ 6”.
Tank front.  On some engines the top edge of the tank front was flush with the tank top. On others the front was extended to the same height as the tank sides with the beading carried round over the tank front.
Chimney.  When built the locomotives had Adams stove pipe chimneys. These were replaced by Drummond from February 1901 with his distinctive design.
Slidebars. From circa 1907 numbers 47,52,57,125,129,415,419 and 520 were fitted with double slidebars.
Splashers.  The splashers of the Beyer, Peacock engines were adorned with that makers builders plates. The splashers of the other engines had a wide beading in a circular arc.
Front frames.  The Neilson & Co. engines had front frames to a profile different from the remainder. The frames of numbers 125 and 520 were replaced by the Southern Railway during an extensive rebuilding at Eastleigh during 1930. The new frames were to a new profile at the front.
Cab cut-out. The Neilson & Co. engines had a different cab side cut out to the remainder.
Boiler handrail.  The position of the boiler handrail knobs depended on the builder. The boiler handrail on the Beyer, Peacock engines was attached with distinctive brackets.
Tank lifting Brackets.  In SR days lifting brackets were fitted to the top of each tank.
Coal Rails.    Three bunker coal rails were fitted from circa 1900. Later still the coal rails were backed by metal sheeting to stop the loss of small coal.
Cab rear windows.  After the fitting of coal rails most engines were fitted with bars of either wood or metal over the rear cab windows. Some of the later survivors were subsequently fitted with smaller windows.
Water filler.  As the coal rail and rear window changes took place so the height of the water filler increased to allow more coal to be carried.
Cab roof.  The original cab roofs were wooden. From circa 1900 they were replaced, by Drummond, with steel roofs.
Safety chains.  When built the engines were fitted with safety chains. These were gradually removed during Drummond’s time.
Steam heating.  From circa 1901 carriage heating steam pipes were fitted.
Lamp brackets.   The locomotives were built with Adam's socket style brackets. Drummond added new brackets of his design over the buffers at the front and rear and above the coupling hook at the rear. The SR standardised on a design with the socket in the lamp and the later survivors were gradually fitted with new brackets of standard design.
Smokeboxes.  When smokeboxes were renewed by the Southern Railway, the flush riveting was often replaced by visible snap head rivets.
Couplings.  The engines in their early years ran with a single, long coupling link often with a separate screw coupling hanging from the draw hook. Later the locomotives were equipped with screw couplings together with a hook to carry the coupling when it was not required.


New Adams boilers.  From 1895 seven new boilers were built and fitted to Nos. 57,170,483, 486,490,492 and 517. With these new boilers came new cabs with round lookout windows.
Drummond boilers.  In 1907 two new boilers of Drummond pattern with dome top safety valves were built and fitted initially to 486 and 520.


Bogie wheels 3’ 0” diameter, 9 spoke (2) Slater’s Ref. 7836ARMF
Driving wheels 5’ 7”diameter, 18 Spokes (2) Slater’s Ref. 7867S
Trailing wheel 3’ 0” diameter, 9 spokes (1) Slater’s Ref. 7836ARMF or 3’ 6” diameter, 10 spokes (1) Slater’s Ref. 7842ARMF
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.
Inside Motion.     A separate kit is available from Finney7 to construct the working inside motion.

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.

Instruction  A4 Pages (PDF)
Instruction A3 Pages (PDF)

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