The South African Railways Class B 0-6-4T of 1893 is a steam locomotive from the pre-Union era in the Transvaal.Between 1893 and 1898 one hundred and seventy-five 46 Tonner 0-6-4T tank steam locomotives were placed in service by the Nederlandsche-Zuid-Afrikaansche Spoorweg-Maatschappij in the Zuid-Afrikaansche Republiek.In 1899 twenty more were ordered, of which only two were delivered by the time the Imperial Military Railways took over all railway operations in the two Boer Republics during the South African War.