533 was a locomotive of the British Great Northern Railway, built by Patrick Stirling in 1876.
A larger boiler was fitted in 1891 making the locomotive a member of the GNR G2 class.
Duties at Doncaster included both heavy lifting and general shunting.
Most were domeless, but an Ivatt domed boiler from a member of the C12 class was fitted.
No known pictures exist showing how this extra length was accommodated.