[1][2][3] Type MT tenders were built between 1928 and 1945 by Berliner Maschinenbau, Borsig Lokomotiv Werke, Henschel and Son, Friedrich Krupp AG, North British Locomotive Company (NBL), Robert Stephenson and Hawthorns, and Škoda Works.

[1] The South African Railways (SAR) placed 67 Class 12A 4-8-2 Mountain type locomotives in service between 1919 and 1929, built by North British and Henschel.

[1][2][3][4][5][6][7] The Type MT tender had a coal capacity of 12 long tons (12.2 tonnes), a water capacity of 6,000 imperial gallons (27,300 litres) and an axle loading of 16 long tons 11 hundredweight (16,820 kilograms).

In addition, eleven spare Type MT tenders were built new and numbered in the range from N47 to N57.

The Type MP1 had a lighter axle load of 13 long tons 15 hundredweight (13,970 kilograms) and was therefore more suitable for branchline work.

[3] A number, when added after the letter code, indicates differences between similar tender types, such as function, wheelbase or coal bunker capacity.

Those which had their bunkers enlarged to a 13 long tons (13.2 tonnes) coal capacity were reclassified to Type MT1, while those which had their bunkers enlarged to a 14 long tons (14.2 tonnes) coal capacity were reclassified to Type MT2.