High-speed Eurostar train services through the Channel Tunnel were severely disrupted today due to an electrical power supply problem near London.
Also affected were high-speed trains operated by the UK's Southeastern train company.
The problem, between London's St Pancras International station and Ebbsfleet International station in northern Kent, was resulting in delays of up to 100 minutes.
Eurostar runs services from St Pancras through the tunnel to Paris and Brussels, while Southeastern Javelin trains travel from St Pancras to stations in Kent, operating on the HS1 high-speed tunnel rail link.
Eurostar said that one of its trains had got stuck in the area of Gravesend in Kent and others had been held at St Pancras.
Southeastern said that two of its Javelin trains had been stuck but that power was being restored.
A Eurostar spokesman said: "We have not had to cancel any services and things are now moving again.
"Passengers must expect delays of between one and two hours. We are texting customers where possible to keep them up to date."