From its head office in Traction House, Motherwell, Kelvin Central had an operating area stretching from Loch Lomond in the west, the Campsie Fells in the north, Shotts to the east and Strathaven to the south.
Kelvin Central was the largest operator in Lanarkshire and Dunbartonshire, and was responsible for urban, rural and interurban services in and around the towns of Dumbarton, Kirkintilloch, Motherwell, Hamilton, Airdrie, Cumbernauld and much of Glasgow.