LB&SCR I1 class

I1 class with modified chimney

Type and origin
Power type	Steam
Designer	D. E. Marsh
Builder	Brighton Works
Build date	1906–1907
Total produced	20
Rebuild date	1925–1932

Specifications
Configuration	4-4-2T
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm)
Driver diameter	5 ft 6 in (1.676 m)
Loco weight	66 long tons 10 cwt (149,000 lb or 67.6 t)
Fuel type	Coal
Water cap	1,839 imp gal (8,360 l; 2,209 US gal) or 1,924 imp gal (8,750 l; 2,311 US gal)
Boiler pressure	170 psi (1.17 MPa)
Cylinders	Two, inside
Cylinder size	17.5 in × 26 in (444 mm × 660 mm)

Performance figures
Tractive effort	17,430 lbf (77.5 kN)

Career
Class	As built: I1 Rebuilt 1925–32: I1x
Power class	BR: 2P (I1x only)
Withdrawn	1944–1951
Disposition	All scrapped

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.

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.

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 reuilding of the B4 and I3 classes. The rebuilt engines were designated I1x class, and these new larger boilders 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Two worn-out members of the class were withdrawn by the Southern Railway in 1944 and 1946 respectively, but the remainder survived into British Railways (BR) ownership in 1948, although all had been withdrawn by July 1951 and none have been preserved.^[1]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

I1/I1X class locomotive fleet summary
LBSC No.	1st SR No.	2nd SR No.	BR No.	Date Built	Date Rebuilt	Withdrawn
1	B1	2001	32001	000000001907-06-01-0000June 1907	000000001931-12-01-0000December 1931	000000001948-07-01-0000July 1948
2	B2	2002	32002	000000001907-07-01-0000July 1907	000000001931-05-01-0000May 1931	000000001951-07-01-0000July 1951
3	B3	2003	32003	000000001907-07-01-0000July 1907	000000001931-09-01-0000September 1931	000000001948-07-01-0000July 1948
4	B4	2004	32004	000000001907-06-01-0000June 1907	000000001932-01-01-0000January 1932	000000001948-11-01-0000November 1948
5	B5	2005	32005	000000001907-08-01-0000August 1907	000000001931-08-01-0000August 1931	000000001951-06-01-0000June 1951
6	B6	2006	32006	000000001907-09-01-0000September 1907	000000001932-02-01-0000February 1932	000000001948-09-01-0000September 1948
7	B7	2007	32007	000000001907-10-01-0000October 1907	000000001931-10-01-0000October 1931	000000001948-09-01-0000September 1948
8	B8	2008	32008	000000001907-10-01-0000October 1907	000000001931-02-01-0000February 1931	000000001951-06-01-0000June 1951
9	B9	2009	32009	000000001907-11-01-0000November 1907	000000001929-12-01-0000December 1929	000000001951-04-01-0000April 1951
10	B10	2010	32010	000000001907-12-01-0000December 1907	000000001929-10-01-0000October 1929	000000001948-09-01-0000September 1948
595	B595	2595	32595	000000001906-09-01-0000September 1906	000000001927-01-01-0000January 1927	000000001951-06-01-0000June 1951
596	B596	2596	32596	000000001906-11-01-0000November 1906	000000001925-07-01-0000July 1925	000000001951-06-01-0000June 1951
597	B597	2597		000000001906-12-01-0000December 1906	000000001928-05-01-0000May 1928	000000001946-12-01-0000December 1946
598	B598	2598	32598	000000001907-01-01-0000January 1907	000000001925-11-01-0000November 1925	000000001948-09-01-0000September 1948
599	B599	2599	32599	000000001907-02-01-0000February 1907	000000001928-10-01-0000October 1928	000000001948-09-01-0000September 1948
600	B600	2600		000000001907-03-01-0000March 1907	000000001927-05-01-0000May 1927	000000001944-10-01-0000October 1944
601	B601	2601	32601	000000001907-04-01-0000April 1907	000000001928-02-01-0000February 1928	000000001948-01-01-0000January 1948
602	B602	2602	32602	000000001907-04-01-0000April 1907	000000001926-12-01-0000December 1926	000000001951-06-01-0000June 1951
603	B603	2603	32603	000000001907-06-01-0000June 1907	000000001928-08-01-0000August 1928	000000001951-04-01-0000April 1951
604	B604	2604	32604	000000001907-04-01-0000April 1907	000000001927-08-01-0000August 1927	000000001948-09-01-0000September 1948

Notes

↑ Bradley 1974, p. 80.

Sources

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

External links

http://www.semgonline.com/steam/i1xclass_01.html

London, Brighton and South Coast Railway locomotives

London and Brighton Railway (1841-1846)	Early locomotives

J. C. Craven (1847–1869)	Craven Locomotives

W. Stroudley (1870–1889)	A1 (list) B1 (list) C C1 D1 (list) D2 (list) E1 G Belgravia Richmond

R. J. Billinton (1890–1904)	B2 B3 B4 C2 D3 E3 E4 E5 E6

D. E. Marsh (1905–1911)	A1X B2X C2X C3 E4X E5X E6X H1 H2 I1 I2 I3 I4 J1 J2

L. B. Billinton (1911–1922)	B4X E2 K L

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