The LNER Class Y1 was a class of 0-4-0 geared steam locomotives built by Sentinel Waggon Works for the LNER and introduced in 1925. They passed into British Railways ownership in 1948 and were numbered 68130-68153.

The superheated vertical water-tube boiler and the engine were similar to those used in Sentinel steam wagons. The engines had poppet valves and reversing was by sliding camshaft. The advantage of the water-tube boiler was that steam could be raised much more quickly than with a conventional fire-tube boiler.

One has been preserved.