The Wilts, Somerset and Weymouth Railway was opened in 1848 from Thingley Junction on the Great Western Main Line and ran via Melksham and Trowbridge to Westbury. It was extended to Frome in 1850. In 1857 the main line was completed to Weymouth.

Main Line:

Chippenham
* Lacock Halt
* Beanacre Halt
Melksham
* Broughton Gifford Halt
* Holt
* Staverton Halt
Trowbridge
Westbury
Frome
* Witham
Bruton
Castle Cary
* Sparkford
* Marston
Yeovil Pen Mill
Thornford
Yetminster
Chetnole Halt
* Evershot
* Cattistock
Maiden Newton
* Grimstone and Frampton
* Bradford Peverell and Stratton Halt
Dorchester
* Monkton and Carne Halt
* Upwey Wishing Well Halt
Upwey (Junction)
* Radipole Halt
Weymouth

Stations marked "*" are no longer open for passenger traffic, and services at Melksham are limited to a service of just two trains each way each day.

Chippenham, Trowbridge and Melksham are the three largest towns, population wise, in the Wiltshire County Council area. Only the city of Salisbury is larger within this area. 

Current train services leave Swindon (the next station towards London from Chippenham) at 06:18 and 18:45 on Monday through Friday for Westbury, where a change is required for onward travel to Weymouth. Eight onward services a day run on to Weymouth, but they are NOT timed to connect with the train sfrom Swindon.