Original sentence: The line runs 6 miles between a southern terminus at East Tanfield, Durham, to a northern terminus at Sunniside, Gateshead, with the main station, Andrews House situated near to the Marley Hill engine shed
Edited sentence: The line runs 3 miles between a southern terminus at East Tanfield, Durham, to a northern terminus at Sunniside, Gateshead, with the main station, Andrews House situated near to the Marley Hill engine shed