The South African Railways Class U 2-6-2+2-6-2 of 1927 was an articulated steam locomotive.
Class U Union Garratt, c. 1930
Class U Union Garratt no. 1370
The South African Railways Class 18 2-10-2 of 1927 was a steam locomotive.
South African Class U 2-6-2+2-6-2
…the most part based on the original as-delivered and unmodified locomotives, the Class U were delivered new with knuckle couplers fitted, as were the Classes 18, GCA, GF and HF which also entered service in 1927. Conversion of all rolling stock would take several years and both coupler types could still be seen…
Builder's picture of the Class 18, c. 1927
Col F.R. Collins DSO
Transition era knuckle coupler
Class 18 with the third cylinder visible, as delivered, c. 1930