LB&SCR I2 class

LB&SCR I2 & I4 classes

LB&SCR I2 class 4-4-2T.

Type and origin
Power type	Steam
Designer	D.E. Marsh
Builder	Brighton Works
Build date	1907-1909
Total produced	I2: 10; I4: 5

Specifications
Configuration	4-4-2T
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm) standard gauge
Leading dia.	3 ft 6 in (1.067 m)
Driver dia.	5 ft 6 in (1.676 m)
Trailing dia.	4 ft 0 in (1.219 m)
Loco weight	68.5 long tons (69.6 t; 76.7 short tons) I2, 70.25 long tons (71.38 t; 78.68 short tons) I4
Fuel type	Coal
Water cap	2,238 imp gal (10,170 l; 2,688 US gal)
Boiler pressure	170 psi (12 bar; 1.2 MPa)
Cylinders	Two, inside
Cylinder size	17.5 in × 26 in (444 mm × 660 mm)

Performance figures
Tractive effort	I2: 17,425 lbf (77.51 kN), I4: 17,790 lbf (79.13 kN)

Career
Retired	1933-1940
Disposition	All scrapped

The LBSCR I2 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. The I4 class were of the same design but incorporated a superheated boiler.

I2 Class

In 1907, following the failure of his I1 class, Douglas Earle Marsh sought to remedy some of the 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.

I4 Class

An I4 incorporating a superheated boiler

When the superheated boilers eventually arrived they were used for five further locomotives of the same design as the I2, but these were classified as I4.

Unfortunately the neither the I2 nor I4 class addressed 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.

Numbering

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.

Withdrawal

All the I2 were withdrawn between 1933 and 1939 but two locomotives, numbers 2013 and 2019, saw further service on the Longmoor Military Railway where they survived until at least 1947. At Longmoor, they were numbered 2400 and 2401 respectively. These numbers were later changed to 72400 and 72401. None of the class has been preserved. The I4 class were withdrawn between 1936 and 1940. No examples of either class have been preserved.

Locomotive Summary

I2 class locomotive fleet summary
LB&SC Number	Built	S.R. Number	Withdrawal	Notes
11	000000001907-12-01-0000December 1907	2011	000000001933-01-01-0000January 1933	I2
12	000000001908-03-01-0000March 1908	2012	000000001935-03-01-0000March 1935	I2
13	000000001908-04-01-0000April 1908	2013	000000001939-01-01-0000January 1939	I2, became W.D. 72400 Earl Roberts
14	000000001908-04-01-0000April 1908	2014	000000001933-02-01-0000February 1933	I2
15	000000001908-05-01-0000May 1908	2015	000000001936-01-01-0000January 1936	I2
16	000000001908-06-01-0000June 1908	2016	000000001933-09-01-0000September 1933	I2
17	000000001908-07-01-0000July 1908	2017	000000001938-01-01-0000January 1938	I2
18	000000001908-07-01-0000July 1908	2018	000000001936-04-01-0000April 1936	I2
19	000000001908-07-01-0000July 1908	2019	000000001937-11-01-0000November 1937	I2, became W.D. 72401
20	000000001908-08-01-0000August 1908	2020	000000001936-02-01-0000February 1936	I2
31	000000001908-09-01-0000September 1908	2031	000000001936-01-01-0000January 1936	I4
32	000000001908-11-01-0000November 1908	2032	000000001937-07-01-0000July 1937	I4
33	000000001908-11-01-0000November 1908	2033	000000001937-07-01-0000July 1937	I4
34	000000001908-12-01-0000December 1908	2034	000000001940-05-01-0000May 1940	I4
35	000000001909-01-01-0000January 1909	2035	000000001937-02-01-0000February 1937	I4

Sources

Bradley, D.L. (1974). Locomotives of the London Brighton and South Coast Railway: Part 3. Railway Correspondence and Travel Society.
Dendy Marshall, C. F. (1988). History of the Southern Railway. Ian Allan. ISBN 0-7110-0059-X. page 271,

External links

http://www.semgonline.com/steam/i2class_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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