Rail passengers between England and France are facing delays after power-supply problems in the Channel Tunnel.

Rail operator Eurostar said trains between London, Paris and Brussels were being delayed by about an hour Wednesday. It's the latest in a series of problems to hit the tunnel since Saturday.

The 50-kilometer (31-mile) Channel Tunnel, which is the only land link between Britain and the European continent, is used by passenger and freight trains, and conveys road vehicles by rail.

The service has been plagued by problems since a smoky load on the back of a truck triggered an alarm, prompting a shutdown of all services.

Operators tried to resume service Sunday but were hit by a power failure.

Eurotunnel said Wednesday's delays were the result of "a power supply line issue."