[1] The Central South African Railways (CSAR) placed five Class 9 Pacific type locomotives in service in 1904.

Hyde, who assumed the position of Chief Locomotive Superintendent of the CSAR upon its inception in July 1902.

[1][2][3] The Type XM3 entered service as tenders to these locomotives, which were acquired to work the Durban-bound mail trains from Johannesburg as far as Charlestown on the Transvaal-Natal border.

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

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