[1] 96 locomotives were built, as follows: Seventeen were fitted with the Westinghouse air brakes for passenger train working, including the only surviving engine of the class, No.

Locomotive 828 (LMS 17566, BR 57566) is the sole survivor of the class and is an important example of Scottish industrial heritage.

[3] Belgian State Railways (SNCB-NMBS) derived three series of steam locomotives (891 units) from the class 812 between 1899 and 1914.

They had a shallower firebox, able to burn semi-bituminous coal and briquettes, allowing a shorter wheelbase due to its positioning above the rear axle.

[4] Rails of Sheffield announced at the opening of Model Rail Scotland on 23 February 2018, that in conjunction with Bachmann Europe Plc they have reached agreement with The Caledonian Railway 828 Trust to produce OO scale models of the 812 Class 0-6-0 locomotives.