* Annual estimated passenger usage based on sales of tickets in stated financial year(s) which end or originate at Trowbridge from Office of Rail Regulation statistics. Methodology may vary year on year.
The small station building is located on the northbound platform (platform 1). This platform is for trains to Bath. Bristol and Cardiff. Platform 2, on the southbound line is for trains to Westbury, London and the South Coast.
The station building contains a ticket office. Inside, there are benches, vending machines and one of the two electronic information signs. There are toilet facilities. Metro newspapers are available and other outdoor seating areas. On Platform 1 are covered bike stands and benches. Platform 2 has an electronic display sign, bike racks, train timetables and a small shelter with benches.
The original WS&WR line diverges to the north of Trowbridge, formerly carried a limited passenger service (two per day each way Mon-Sat, one each way on Sundays) to/from Swindon via Melksham and Chippenham. This was improved to a two-hourly service (8 trains each way total on weekdays, 5 each way on Sundays)) at the December 2013 timetable change. Two services continue beyond Swindon through to Cheltenham Spa on weekdays only.
The station is served by a limited service between Bristol Temple Meads and London Waterloo (3 per day Mondays to Saturdays, 2 on Sundays) by South West Trains.