LONDON — Eurostar advised passengers to postpone their journeys on Tuesday to a later date, citing "major disruption" including severe delays and cancellations. The operator blamed the travel chaos on "a problem with the overhead power supply in the Channel Tunnel and a subsequent failed Le Shuttle train." "We strongly advise all our passengers to postpone their journey to a different date," Eurostar said in a message on its website. "Please don't come to the station unless you already have a ticket to travel. "We regret that trains that can run are subject to severe delays and last-minute cancellations," it added. Eurostar, which operates services between Britain and mainland Europe, urged customers to "check for live updates on the status of your train." The disruption came in the very busy travel period between Christmas and New Year's Day. Eurostar runs trains from London's St. Pancras station to locations including as Paris, Brussels and Amsterdam. LeShuttle also operates vehicle-carrying trains between Folkestone in southeast England and Calais in northern France. A record-high 19.5 m