A non-passenger train derailed and caused damage to signalling and overhead wires last night, according to Great Western Railway (GRW).
The station issued a picture of the damage in a tweet:
Due to extent of the damage to the overhead pwr cables over a wide area only 2 tracks are open for a reduced service pic.twitter.com/dbjwkejOJF— London Paddington (@NetworkRailPAD) June 17, 2016
Network Rail has announced that it will not be removing the derailed train until 10pm tonight so as to ensure maximum capacity for the peak evening travel time.
Now NOT going to remove the derailed train at Paddington until 2200 tonight as we need to ensure maximum capacity for evening peak.— Network Rail Western (@networkrailwest) June 17, 2016
No Heathrow Connect Service is running as a result of the accident, while Heathrow Express services have been reduced to running every 30 minutes.
Passengers looking to travel between Reading and Waterloo have been advised to make their journeys via Guildford or Basingstoke instead.
Network Rail also warned that services are expected to be "very busy" today as the Royal Ascot races are taking place, and South West Trains said there were delays to trains through Ascot because of crowding arising out of the Paddington issues.
GRW issued the following travel advice on Twitter: