Channel Tunnel operator Eurotunnel resumed the transport of trucks following a break caused by a power failure, a Eurotunnel spokeswoman said.
The incident last week was the latest glitch in the undersea system that connects England with France.The truck service was restored only last month on a trial basis following a blaze in the tunnel last November that caused $325 million of damage and injured several people.
It was suspended again as a precaution for several hours Thursday after a train carrying cars and passengers was trapped in the tunnel for 30 minutes Thursday morning in an initial power failure. It was resumed late Thursday.
Witnesses on the train spoke of a flash and a loud bang but the Eurotunnel spokeswoman said there was no danger to passengers at any time.
Eurotunnel has been carrying trucks free of charge pending authorization for a full resumption of freight traffic, which it hopes to receive by mid-June.
The freight business is seen as essential for Eurotunnel, struggling to secure shareholder and bank support for a plan to restructure its $12 billion debt.
The decision to reopen the tunnel was fiercely criticized by some independent safety experts and Britain's firefighters' union which claimed open-sided railcars are dangerous.