COMMUTERS are warned against travelling on the Waterloo line today after a train derailed yesterday morning. 

At 5.40am on Tuesday a passenger train collided with a stationary barrier train. 

Despite its low speed, the train became derailed

Work to 're-rail' the train was underway yesterday afternoon. Network Rail will then need to examine what, if any, damage was caused to the track.

A statement from Network Rail read: "The incident happened as the train was pulling away from its platform at Waterloo.

"There were no injuries to the 23 passengers or two members of staff on board the train.

"The barrier train was in place to separate the ongoing engineering works at Waterloo from the operational train services.

"An investigation to establish the cause of the incident is underway. It would not be appropriate to speculate on the cause of the incident at this time.

"Upgrade work to extend platforms at Waterloo continues."

A very limited service is now running to and from Waterloo, which is expected for the rest of today.

Trains from Bracknell, Wokingham and Ascot trains are likely to be severely affected.