Passengers have been warned of delays after a freight train derailed at West Ealing in west London.
National Rail said on X the derailment was due to an “operational incident”.
It says disruption is affecting the line between Paddington, Heathrow Airport and Reading, and could last until midday on Friday.
Transport for London (TfL) says there are severe delays on the Elizabeth line due to a “faulty freight train”.
A Network Rail spokesperson said: “At around 6:10 this morning, a freight train travelling on to the West Ealing goods loop passed a red signal and three wheels of the locomotive came off the tracks.
“There were no injuries, and we closed the adjacent lines to assess that it was safe for trains to pass.
“One of the lines has now reopened to passenger trains and a team is on site to assess the situation with the freight train and whether the second adjacent line can be safely reopened.”
On its website, National Rail said Great Western Railway (GWR), Elizabeth line and Heathrow Express passengers may be affected by the derailment.
In a statement, it said trains could be cancelled, delayed or diverted including on the Elizabeth line between Abbey Wood and Heathrow Terminal 4, Maidenhead and Reading; between London Paddington and Reading; and between Shenfield and Heathrow Terminal 5.
Heathrow Express trains between London Paddington and Heathrow Terminal 5 may also be affected, it said.
It comes after Network Rail announced last month it would develop a recovery plan for the Reading-London Paddington route, after months of poor performance.
The route is now set to be overhauled in three phases over 18 months.
In December, broken wires left 4,000 passengers stranded on trains for four hours at night near Ladbroke Grove in west London.
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