A "colossal" crane of 60 tons was later built at Keyham, with a cell plate stiffened by four cells. This crane was worked by four men driving through a gear train of 632 times, which must have been hard and slow work at full capacity. As the capacity of the crane was so obviously limited by its motive power, not its strength, they were an obvious candidate for steam power – as was later re-applied to the 60 ton crane at Keysham. There was even a proposal for a high crane, to replace masting sheers at Woolwich. A more typical size for most of these later cranes though would be able to lift 35 tons at a radius of . They were powered by self-contained steam engines, with both boiler and engine mounted on board the crane.
