Eurostar will begin running double-decker trains through the Channel Tunnel for the first time, the company announced Wednesday, as it braces for increased competition on its cross-Channel routes between London and mainland Europe.

Of the five companies with intentions to operate on the high-speed line through the Channel Tunnel, only Eurostar – which has had the monopoly for the past 30 years – has put in an order for new trai...

The fully electric fleet of trains will be named Eurostar Celestia, which comes from the Latin word caelestis, meaning "heavenly".