In reply to nonymouse:
The only cross-channel rail traffic now is by Eurostar, the other crossings involve change of carrier, and are not simple as the previous systems (train and ferry, or train and hovercraft no longer exist). I think it's the growth of cheap flights that has knocked it all on the head... London or Newcastle/Marseille by plane is now so much cheaper than train that very few are interested.
I had a neighbour who absolutely refused to take the tunnel for some reason and tried to find a way of crossing from Paris to Maidstone as she had always done and found it far more expensive than Eurostar, involving taxis at Calais and Dover, IIRC. Times change! Most people prefer 2h45 Paris/London to 7 hours!