SR E1/R

The SR E1/R Class was a series of 0-6-2 side-tank locomotives produced by Richard Maunsell on the Southern Railway from 1927 by rebuilding LBSCR Stroudley E1 Class 0-6-0 side-tank locomotives with a new rear trailing axle — converting them from 0-6-0T to 0-6-2T configuration — to give the locomotives better stability and increased bunker capacity for working the SR's longer suburban and country branch duties in the west of England, particularly on the former-LSWR routes in Devon and Cornwall where the E1's endurance on longer runs had been found wanting.

Stroudley's original LBSCR E1 Class had been an excellent 0-6-0T shunting and suburban tank of the 1870s, robust and reliable in service on the LBSCR's urban and suburban network. When the Southern Railway inherited these veterans in 1923 and found them still serviceable but limited in range by their small bunker, Maunsell's solution — rather than scrapping them — was to rebuild them with a rear carrying axle that allowed a larger coal bunker to be fitted, transforming the useful range of the locomotives and making them suitable for the longer country branch workings that the SR needed them to handle in Devon and Cornwall.

The E1/R rebuilds gave useful further service on SR and early BR country branch duties in the South West. None was preserved in E1/R form, though the original E1 design tradition is represented by preserved LBSCR Stroudley tank engines at the Bluebell Railway.