A freight train blocking the line is causing huge delays for Thameslink and Southern this morning.

This train was supposed to cross over onto the Wessex route earlier this morning but has been unable to due to overrunning engineering works in the Surbiton area.

A statement posted on National Rail website said: "Due to no alternative routes being available for the train to take the southbound line is currently blocked.

"Most planned engineering work by Network Rail happens overnight, at weekends and on bank holidays, as this minimises disruption to passengers whilst also keeping engineers safe. Sometimes bad weather, machinery failure or unexpected complications can cause works to overrun."

RELATED: SW Rail customers advised NOT to travel this morning due to major delays

Trains towards Wimbledon from Streatham, and from Wimbledon towards Sutton, will be unable to call at the following stations:

  • Tooting
  • Haydons Road
  • Wimbledon
  • Wimbledon Chase
  • South Merton
  • Morden South
  • St. Helier
  • Sutton Common
  • West Sutton

Trains may be cancelled or delayed by up to 20 minutes becasue of this issue.