National Express operate direct services between Marlborough and Trowbridge Marlborough to Trowbridge is a distance of 21 miles (35 kilometres). National Express operate 1 direct buses per day. The fastest journey each day takes 0hrs 50mins. See our route guide and coach timetables below for more details. Doing a search on Coachfairer is the best way to find the fastest journeys by all operators and the cheapest prices!