In 1915, the South African Railways placed six Class J tank steam locomotives with a 4-6-4 Baltic type wheel arrangement in service.

[1][2][5] Six of these locomotives were built by Nasmyth, Wilson and Company of Patricroft in Salford, England, and delivered in 1915, numbered in the range from 341 to 346.

They were designed to work as double-enders on the Natal South Coast line where there was limited engine turning facilities.

[1][2] It was soon found, however, that due to their small proportions, they were of insufficient power to handle the rapidly increasing loads on the South Coast.

It was later acquired by the South African National Railway And Steam Museum (SANRASM) for preservation.