The Great Northern Railway (GNR) Class J13, classified J52 by the LNER is a class of 0-6-0ST steam locomotive intended primarily for shunting.

Some locomotives were fitted with condensing apparatus for working on the Metropolitan Railway.

Condensing apparatus was added to, or removed from, locomotives when they were allocated to, or away from, the London area.

Forty-eight J52/1s and eighty-five J52/2s passed to British Railways in 1948 and they were numbered 68757–68889.

[2] In 1980 it was donated to the National Railway Museum and made regular visits to other preserved railways and museums on its two Boiler Ticket durations in preservation.