The sound of a 1960’s class 37 locomotive starting up in the morning. D6700 was the first class 37 built. Seen here at Loughborough Central station on the Great Central Railway | Adrian Watson

A glimpse inside the cab of the first class 37 locomotive built. This was built in 1960 and since entering preservation has been restored to as close to original condition as possible. It is a regular runner on diesel days at the Great Central Railway. | Adrian Watson

Class 8 Maths Chapter 1 Example 1.21