LB&SCR I1 class

The LB&SCR I1 class was a class of 4-4-2 steam tank locomotives designed by D. E. Marsh for suburban passenger service on the London, Brighton and South Coast Railway.

LB&SCR I1 class
I1 class with modified chimney
Type and origin
Power typeSteam
DesignerD. E. Marsh
BuilderBrighton Works
Build date1906–1907
Total produced20
Rebuild date1925–1932
Specifications
Configuration:
​
 • Whyte4-4-2T
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver dia.5 ft 6 in (1.676 m)
Loco weight66 long tons 10 cwt (149,000 lb or 67.6 t) (74.6 short tons)
Fuel typeCoal
Water cap1,839 or 1,924 imp gal (8,360 or 8,750 l; 2,209 or 2,311 US gal)
Boiler pressure170 psi (1.17 MPa)
CylindersTwo, inside
Cylinder size17.5 in × 26 in (444 mm × 660 mm)
Performance figures
Tractive effort17,430 lbf (77.5 kN)
Career
Class
  • As built: I1
  • Rebuilt 1925–32: I1x
Power classBR: 2P (I1x only)
Withdrawn1944–1951
DispositionAll scrapped

History

This class was intended to haul secondary passenger trains, especially in the south London suburbs, and twenty locomotives were constructed by Brighton works between June 1906 and December 1907. The locomotives proved to be reliable but with disappointing performance in their original form, being poor steamers, but all of them passed to the Southern Railway in 1923. They reportedly gained the nickname "wankers" due to their poor steaming capabilities.

I1X class
I1X class 2597 at Brighton 1946

Between 1925 and 1932 they were rebuilt by Richard Maunsell with spare boilers left over after the rebuilding of the B4 and I3 classes. The rebuilt engines were designated I1x class, and these new larger boilers greatly improved their performance.

Withdrawals

Two worn-out members of the class were withdrawn by the Southern Railway in 1944 and 1946 respectively, but the remainder survived into British Railways (BR) ownership in 1948, although all had been withdrawn by July 1951 and none have been preserved.[1]

Numbering

The first ten were numbered 595-604 and the second ten were numbered 1-10. The Southern Railway initially added a "B" prefix to these numbers and later renumbered them 2595-2604 and 2001-2010. BR added 30000 to the numbers but it is believed that only 32005 actually carried its number.

Locomotive Summary

Notes
  1. Bradley 1974, p. 80.

Sources
  • Bradley, D.L. (September 1974). The locomotives of the London Brighton and South Coast Railway, Part 3. London: RCTS.CS1 maint: ref=harv (link)
  • Dendy Marshall, C. F., History of the Southern Railway, Ian Allan 1988, page 270, ISBN 0-7110-0059-X
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