Passengers travelling through Paddington this evening have been warned to brace themselves for further disruption after a derailed train caused chaos at the station.
The two-coach Great Western Railway service came off the line shortly after 6pm on Thursday, when it hit a gantry carrying overhead power lines at the station.
The incident caused damage to some of the station's overhead line equipment, causing disruption to thousands of journeys.
Engineers have postponed some of the repair work until after 10pm this evening to minimise disruption for passengers travelling at rush hour.
Network Rail has already managed to reopen four of the six rail lines into and out of the station, but Great Western Railway has warned two lines are likely to remain closed for at least the rest of today.
The operator has put an amended timetable in place on its Thames Valley routes, and its and on lines between South Wales, Bristol and London.
Just over half of the trains on these routes will be running.
There will also be no Heathrow Connect services running through the station, will the Heathrow Express service will go every 30 minutes.
Pre-booked Heathrow Connect tickets will be accepted on the Heathrow Express.
Great Western Railway services into and out of London Paddington from Devon and Cornwall are largely unaffected, but customers habve been advised to check before travelling on other parts of the GWR network.
A GWR spokesman said: "We're sorry for the continued disruption this incident has caused customers, and we are working with Network Rail to get things back to normal as safely and quickly as possible.
"Many of our services continue to operate, but some services are likely to be busier than normal and we are asking customers to check before travelling."
