the difference in stroke was made up by providing deep spigots on the cylinder covers. The 2-10-4 Texas type wheel arrangement had not been tried before on the SAR. To distribute the axle loads to within the maximum allowed for branch lines, the ten-coupled arrangement with a four-wheeled trailing bogie was required. To further assist with keeping within the permissible weight limits, the cab was of welded construction and all footplates and running boards were made of duralumin while the axles and crank pins of the coupled wheels were hollow and the connecting rods were of special high tensile steel. The equalised suspension of the engine was arranged in the customary three groups. The leading Bissel bogie and the first two pairs of coupled wheels were equalising in one group, while the remaining three pairs of coupled wheels were equalised with the trailing bogie, on each side (not cross-connected); thus three groups. As is usual, cross equalisation (LHS to RHS) was provided between the leading Bissel bogie and leading coupled wheels. Instead of pins, case-hardened cotters were provided for fulcrums of the bearing spring equalisinging beams. The proportion of balanced reciprocating parts was only 6% which reduced the hammer blow on the rails to per wheel at . The locomotive was noted for its smooth running. Tender The Type FT tender was an unusual type which used six pairs of wheels in a 2-8-2 wheel arrangement, with the leading and trailing wheels in Bissel-type pony trucks and the rest of the axles mounted with a rigid wheelbase. Like the leading and trailing wheels of the engine, all tender wheels were fitted with roller bearings. The rationale behind the design was that if the tender frame could be carried on more points represented by the rigid and Bissel wheels instead of on only two bogie pivot centres, the frame could be made lighter. The tender was equipped with a mechanical stoker. The water tank was of welded construction and the coal bunker was of the self-trimming design. Each Bissel truck was compensated with two pairs of rigidly mounted wheels. The eight rigidly mounted wheels were fitted with overhead laminated bearing springs while the spring gear for each pony truck and two adjacent axles were compensated throughout the springing system, constituting two equal groups. Vacuum cylinders mounted on top of the tank actuated brake blocks on the rigidly mounted wheels. The tender's