Eurostar has revealed plans to run double-decker trains through the Channel Tunnel for the first time.

The cross-channel rail operator has confirmed it will order up to 50 trains from manufacturer Alstom, eventually increasing the size of its fleet by nearly a third.

The expansion plans would include investing heavily in a crucial London depot, it said.

But questions remain over whether the facility has enough space for both Eurostar and potential rival operators to use it.

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