LB&SCR I6 Class
The LB&SCR I6 Class was a series of outside-cylinder 4-4-2 Atlantic side-tank locomotives designed by Douglas Earle Marsh and introduced in 1909, the third of three I-class variants introduced by Marsh in that year alongside the I4 and I5. The I6 completed the trio of 1909 Atlantic tank specifications with its own distinct boiler or cylinder dimensions, and the three 1909 variants together gave Marsh valuable comparative data on the relative merits of different Atlantic tank specifications under the same LBSCR operating conditions.
The I6 worked the same range of LBSCR outer-suburban and coastal express duties as the other I-class variants, and the class passed to the Southern Railway at the 1923 Grouping. Under the SR the various I-class variants were operated together on the former-LBSCR express suburban routes, the detail differences between variants being of limited operational significance once the locomotives were incorporated into the larger SR fleet.
None was preserved.
Design and development
The third of three 1909 I-class variants alongside the I4 and I5, with its own distinct specification completing Marsh's comparative evaluation of Atlantic tank configurations.
Service and withdrawals
Worked LBSCR coastal and outer-suburban express services from 1909. SR ownership 1923; withdrawn 1940s–50s. None preserved.
Identification features
Inside-cylinder 4-4-2 tank.
Notable locomotives
- Various — none preserved
