In recent years, Britain has been trying to extend HS1 (high speed 1) to the rest of Britain. They're extending the high speed railway from London to Birmingham so you would be able to get a train from Birmingham to Paris or another city in Europe. At the moment you can take a train from St Pancras station in London to Paris, Amsterdam or other European cities; I think rail freight can move between European cities on these high speed railways as well.
The problem is the land in Britain is so expensive that they would pay £billions before they layed down any track buying land.
They're now thinking of cancelling the extension of the railway beyond Birmingham. They think, if it cost more than £100 billion, it would would take a long time for the trains to earn that money back again.