The Wilts, Somerset and Weymouth Railway (WS&WR) was an early railway company in south-western England. It obtained Parliamentary powers in 1845 to build a railway from near Chippenham in Wiltshire, southward to Salisbury and Weymouth in Dorset. It opened the first part of the network but found it impossible to raise further money and sold its line to the Great Western Railway (GWR) in 1850.

The Great Western Railway (GWR) was a British railway company that linked London with the southwest, west and West Midlands of England and most of Wales. It was founded in 1833, received its enabling act of Parliament on 31 August 1835 and ran its first trains in 1838 with the initial route completed between London and Bristol in 1841. It was engineered by Isambard Kingdom Brunel, who chose a broad gauge of 7 ft —later slightly widened to 7 ft 1⁄4 in —but, from 1854, a series of amalgamations saw it also operate 4 ft 8+1⁄2 in standard-gauge trains; the last broad-gauge services were operated in 1892.