The Rolls-Royce C range was a series of in-line 4, 6 and 8 cylinder diesel engines used in small railway locomotives, construction vehicles, marine and similar applications. They were manufactured by the Rolls-Royce Oil Engine Division, initially at Derby and later at Shrewsbury, from the 1950s through to 1970s.Although officially termed the C range, they were best known for the most common C6SFL six-cylinder variant. Most had an output of around 200 bhp, with 233 bhp for the final models.