LONDON -- A disruption in the Channel Tunnel on Tuesday prompted Eurostar to request that train customers postpone their journeys until another time. Delays and cancellations are being caused by an overhead power supply problem and a failed Le Shuttle train, the operator said. Le Shuttle trains transport vehicles between England and France.

Traffic slowly resumed Wednesday in the Channel tunnel after an electricity failure halted train trips connecting London to the European mainland, as frazzled passengers arrived in France after hours trapped in a powerless train.

Eurostar has told passengers not to travel due to a “major disruption” in the Channel Tunnel, and to expect severe delays on trains booked for departure soon. A statement issued by the train service on Tuesday morning advises that a problem with the ...