 In 1912, when they were assimilated into the South African Railways, they were renumbered and designated Class MF.Five more of these locomotives were delivered in November 1911 and were numbered directly onto the South African Railways roster.Nine Mallet articulated compound steam locomotives which were delivered to the Central South African Railways (CSAR) in 1911 were built by the American Locomotive Company (ALCO) in 1910 and 1911.