Cardiff-London trains return to normal after signal problems
Train services from Cardiff Central to London Paddington are returning to normal after being hit by disruption caused by major signalling problems.
First Great Western (FGW) said services were affected by earlier problems at Maidenhead.
All lines have reopened, but there may be delays of up to 20 minutes before normal service is achieved, FGW said.
Some services were cancelled and passengers were asked to check the FGW website for travel information.