[1][2][3] In the South African Railways (SAR) years, tenders were numbered for the engines they were delivered with.

[1][3][5] Soon after entering service in 1910, the CSAR Class 10-C light Pacific locomotives, acquired for suburban working, were found to be capable of handling mainline passenger trains.

To better equip them for mainline working, an order for twelve new Type XM2 tenders for these engines was placed with Robert Stephenson and Company.

[2][3][6] In addition, 24 more spare Type XM2 tenders were subsequently acquired by the SAR, numbered in the range from N13 to N36.

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