LB&SCR I2 Class

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==
When the superheated boilers eventually arrived they were used for five further locomotives of the same design as the I2, but these were reclassified as "I4 Class".
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 E4 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All the I2 were withdrawn between 1933 and 1939 but two locomotives, numbers 2013 and 2019, saw further service on the Longmoor Military Railway where they survived until at least 1947.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. The I4 class were withdrawn between 1936 and 1940.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 	December 1907 	2011 	January 1933 	I2
12 	March 1908 	2012 	March 1935 	I2
13 	April 1908 	2013 	January 1939 	I2, became W.D. 72400 Earl Roberts
14 	April 1908 	2014 	February 1933 	I2
15 	May 1908 	2015 	January 1936 	I2
16 	June 1908 	2016 	September 1933	I2
17 	July 1908 	2017 	January 1938 	I2
18 	July 1908 	2018 	April 1936 	I2
19 	July 1908 	2019 	November 1937 	I2, became W.D. 72401
20 	August 1908 	2020 	February 1936 	I2
31 	September 1908	2031 	January 1936 	I4
32 	November 1908 	2032 	July 1937 	I4
33 	November 1908 	2033 	July 1937 	I4
34 	December 1908 	2034 	May 1940 	I4
35 	January 1909 	2035 	February 1937 	I4
== Trivia ==
* The LB&SCR I2 boiler design was eventually reused for the creation of the LB&SCR E2 Class.
Category:4-4-2T steam locomotives
Category:4-4-2T locomotives
Category:British locomotives
Category:Steam locomotives
Category:Locomotives
Category:Tank locomotives
Category:Scrapped locomotives
Category:United Kingdom
Category:Passenger locomotives
Category:British steam locomotives
Category:4-4-2 steam locomotives
Category:4-4-2 locomotives
Category:Built in 1907
Category:Built in 1908
Category:Built in 1909
Category:Brighton Works locomotives
Category:LB&SCR locomotives
Category:4 foot 8 1⁄2 inch gauge
Category:Standard gauge locomotives
Category:Standard gauge steam locomotives of Great Britain