The NZASM 19 Tonner 0-4-2T of 1891 was a South African steam locomotive from the pre-Union era in Transvaal. In 1891 and 1892, the Nederlandsche-Zuid-Afrikaansche Spoorweg-Maatschappij of the Zuid-Afrikaansche Republiek (Transvaal Republic) placed 24 tank locomotives with a 0-4-2 wheel arrangement in service. Between 1906 and 1909, ten of them were converted to railmotor engines by the Central South African Railways, for use on suburban passenger services.