The tenders initially rode on drawing x-6002 standard bogies fitted with grease-lubricated bearings. Later, drawing x-10161 bogies, still fitted with grease-lubricated bearings were substituted on some locomotives as they came in for an overhaul. A later variant was the drawing x-11183 'Timken' roller-bearing bogie fitted to the WAB class conversions of 1947-57 and as used under the G class locomotive tenders from 1937. Enthusiasts were able to identify these different types of bogies by their design characteristics - for example, the x-6002 bogies had a prominent journal box and were made of steel bar sections.