According to the "British Railways Maps and Gazetteer", Highworth was the terminus of a short GWR branchline from Swindon with intermediate stations at Stratton, Stanton and Hannington. In 1861, Swindon Works employees couldn't have used the line to get to work as it didn't open until 1883. It closed in 1953.
Further information about Highworth here:
http://www.swindon.gov.uk/highworth.pdf