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British Railway Steam Locomotive

Please read this statement on the accuracy of the data shown below

Note: To Obtain Consistency in the Steam System, Shed Codes used are those Registered at Nationalisation on 1st January 1948
2nd Grouping Number
1st Grouping Numbersr 2018
2nd Pre Grouping Number
1st Pre Grouping Numberlbsc 18
Works/Lot Number
Class CodeI2
DesignerMarsh DE
BuilderBrighton Works (SR/British Railways)
1948 Shed
Last Shed75A Brighton
Disposal detailsEastleigh Works (B.R.)
DisposalCut Up
Disposal Date31/05/1936

Class Information

The LB&SCR I2 class was a class of 4-4-2 steam tank locomotives designed by Douglas Earle Marsh for suburban passenger service on the London, Brighton and South Coast Railway. The I4 class were of the same design but incorporated a superheated boiler.

In 1907, Marsh followed up his not-at-all-successful failure of his I1 class of 1906 with another lack-lustre product, the I2 class 4-4-2T in 1907. Marsh sought to remedy some of the I1 faults with a new design of 4-4-2T with a longer wheelbase, larger boiler and detailed changes to the front end. In the original order, five of the locomotives would incorporate a superheated boiler, to be supplied by the North British Locomotive Company, and the remainder traditional saturated steam boilers from Brighton Works. In the event, the superheated boilers were delayed in construction and so all ten I2 locomotives had traditional boilers. When the superheated boilers eventually arrived they were used for five further locomotives of the same design, but which were classified I4.

Unfortunately the modifications in these designs did not address the fundamental problems with the I1 class, which was a firebox that was far too small. As a result the two classes had relatively short lives working lightly loaded secondary services, and the Stroudley D1 class, and Billinton D1 class, which they had been designed to replace, continued working.

The first built was No. 11, following on sequentially from the last of the I1 numbers, which had very similar dimensions as the twenty predecessors but with a boiler diameter increased from 4' 3" to 4' 6" and an extended smokebox mounted on a saddle. The performance of the engines, though, was far below expectations which led to a short life with the first two withdrawn by the Southern Railway in 1933 without any attempt at the re-building which had been so successful with the I1 class.

LB&SCR numbers were 11-20 and 31-35. The Southern Railway, which acquired the locomotives in 1923, initially numbered them B11-B20, B31-35 and later 2011-2020, 2031-2035.

All the I2 were withdrawn between 1933 and 1939, although two, No. 13 withdrawn in 1939 and No. 19 withdrawn in 1937, SR numbers 2013 and 2019, had a further life after withdrawal when they were placed over running-shed pits at Bournemouth, sand-bagged and used as air raid shelters. Then in 1942 fate smiled more kindly on them and they were purchased by the Government to work passenger trains on the Longmoor Military Railway where they survived until at least 1947. At Longmoor, they were first numbered 2400 and 2401 respectively. These numbers were later changed from 1944 to 72400 named Earl Roberts and 72401.

The first loco withdrawn was SR 2011 in January 1931.
The last loco withdrawn was SR 2013 in January 1939 from Brighton shed (the two WD locos lasted until at least 1947).

None of the class has been preserved.

Technical Details

Designer : D.E. Marsh
Builder : Brighton Works
Build date : 1907-1908
Total produced : 10
Configuration : 4-4-2T
Gauge : 4 ft 8 in (1,435 mm)
Leading wheel diameter : 3 ft 6 in (1.067 m)
Driver wheel diameter : 5 ft 6 in (1.676 m)
Trailing wheel diameter : 4 ft 0 in (1.219 m)
Locomotive weight : 68.5 long tons (69.6 t)
Fuel type : Coal
Water capacity : 2,238 imp gallons (10,170 l; 2,688 US gal)
Boiler pressure : 170 psi (1.2 MPa)
Cylinders Two (inside)
Cylinder size 17 in 26 in (445 mm 660 mm)
Tractive effort : 17,425 lbf (77.51 kN),
Retired : 1933-1939

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