The 88bhp Ruston 88DS is the 'big brother' to the 48DS, designed to be powerful enough to replace a small steam shunting locomotive.
Ruston 441934 was built new for chocolate and confectionery manufacturers Rowntree & Co. Ltd of York, delivered in April 1960 and joining fellow Ruston 88DS locomotives 421419/1958 and 432479/1959 as No. 3. In 1979 a new 0-6-0 locomotive was bought for the York factory and No.3 was transferred to Rowntree’s Fawdon, Newcastle factory until rail service there ended in 1987. No. 3 was passed to the North York Moors Railway for preservation, but in 2013 was quite fittingly acquired by two members of the Derwent Valley Light Railway and has returned to York, being named Ken Cooke in honour of a former Rowntree’s employee, a D-Day veteran and holder of the Legion d’Honneur.