Sentinel 0-6-0 'Pride of the Fens' Potter Logistics Diesel LocomotiveFounded as Ally & MacLellan, Glasgow in 1875 and then later known as the Sentinel Waggon Works Ltd, the company went through various place and name changes until in 1957 Sentinel (Shrewsbury) Ltd was obtained by Rolls Royce. At that time Sentinel were producing steam locomotives and lorries, but the manufacturing of these vehicles ceased in 1958. In 1959, Sentinel produced a prototype diesel shunter which was operated on the military controlled