A SIGNALLING problem between Wokignham and Reading is causing delays of up to 30 minutes.
National Rail tweeted at 11.15am that delays between the stations are expected until 2pm.
Some services will start and terminate at Wokingham or Ascot, and will not call at stations towards Reading.
The disruption is affecting South West Trains services between Reading and London Waterloo, and Great Western Railway services between Reading and Redhill.