4-4-2T Class I3 LBSCR Profile and Models

The LB&SCR I3 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. After introducing two unsuccessful designs of 4-4-2 tank locomotive with the I1 and I2 classes, Douglas Earle Marsh learned a lesson and provided a new design with a far larger firebox in the form of the I3 class. At the time of its introduction locomotive engineers were beginning to take an interest in superheating and Marsh therefore ordered two locomotives from Brighton Works for comparative purposes, one with a traditional saturated boiler and one incorporating the Schmidt superheater. Both varieties of the I3 class proved themselves to be excellent locomotives but the superheated versions were significantly cheaper to run on express trains. All were withdrawn between January 1950 and May 1952, having all completed very high mileages. No example has been preserved.

(Information provided via Wikipedia)

Type of Locomotive

Builder

Build Date

Total Built

Tractive Effort

Wheel Configuration

Operated By

Main Duties

In Service Until

Surviving Examples