Abner Doble, maker of the high quality American steam car, arrived at Shrewsbury to design a new revolutionary steam lorry.
The last Super Sentinel ran off the production line (No 8608). Some 1546 having been built from June 1923.
A shaft-driven DG6 waggon was shown at the Commercial Motor Show (No 8667). The SDDG6 was designed to be 10% lighter than that of the chain-driven models. This waggon had pneumatic tyres and steam brakes fitted to all six wheels.
Only one other SDDG6 was built. (No 8709).
Twelve single-geared light-weight Supers were put on the market.
Prototype “Sentinel-Doble” lorry was tested with two-cylinder compound double acting engine in-situe with the back axle.
The new revolutionary design of an Automatic Stoker was fitted to certain DG waggons to make them one-man operated.
Doble engined Railbus supplied to Southern Railway (No 8740). Only four more Railbuses were built in June 1934.