[1][2] The original Cape Government Railways (CGR) 6th Class locomotive and tender was designed at the Salt River works of the CGR in Cape Town in 1892, under the supervision of Western System Locomotive Superintendent H.M. Beatty.

These rebuilt tenders had a more modern appearance, with flush sides all the way to the top of the coal bunker.

[1][2] The program to rebuild several older tender types with new upper structures was begun by Col F.R.

Collins DSO, who approved several of the detailed drawings for the work during his term in office as Chief Mechanical Engineer (CME) of the SAR from 1922 to 1929.

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