Carstairs is a village in South Lanarkshire, Scotland. Carstairs is located 5 miles east of the county town of Lanark and the West Coast Main Line runs through the village. The village is served by Carstairs railway station, which is served by the Caledonian Sleeper to and from London Euston. Carstairs is best known as the location of the State Hospital. Carstairs is applied to the places Carstairs Village and the village of Carstairs Junction where the railway station is situated. The two places are two completely different villages divided by 1 mile of land, a parkland area and the railway line.