A TRESPASSER on the railway line is causing chaos for Glasgow passengers.

Services are set to be disrupted between Motherwell and Lanark until around 4pm.

Trains between Glasgow Central and Lanark are expected to return to normal shortly but Network Rail have warned delays and revisions may still occur.

ScotRail first reported a trespasser on the line shortly after 2pm this afternoon.

Passengers are advised to check the firm's website before travelling.