L&YR Class 31

The L&YR Class 31 was a class of steam locomotives of the Lancashire and Yorkshire Railway. The class was designed by George Hughes and introduced in 1912. The class comprised 115 new locomotives and 40 rebuilt from two other classes: the 91 Class and the 9 Class.

Superheaters

All of the locomotives were superheated. Three main types of superheater were used: the Horwich "twin plug" type, fitted to twenty locomotives of the 1546 class and eight of the 91 Class; the Robinson type, fitted to ten of the 1546 class; and the Horwich "top and bottom header" type, fitted to the remaining 117 locomotives.

Transfer to LMS

The locomotives passed to the London, Midland and Scottish Railway in 1923. The LMS numbered them 12840-12994 and gave them the power classification 7F.

Transfer to BR

In 1948, British Railways inherited 17 locomotives and numbered them in the range 52841–52971.

Withdrawal

No examples of this class were preserved.