One of the last possible routes for an additional rail tunnel into Penn Station will be preserved, even as a thicket of skyscrapers rises above it, U.S. Sen.
The Queen, accompanied by the Duke of Edinburgh, will open train company Eurostar's new terminal at St Pancras station and also the completed Channel Tunnel Rail Link that has enabled Eurostar trains to start and finish journeys there.
If the Hudson Yards project continued without the casement, officials said, it would block access for any new tunnel projects looking to serve Penn Station's existing tracks.
Eurostar services were suspended at 0830 GMT after a Eurostar train travelling from Brussels to London's Kings Cross station was delayed for an hour inside a tunnel.