Quote Originally Posted by robt View Post
No one on here knows the loading gauge of the tunnels, therefore lightrail could be made to fit, heavy rail may not fit.
As heavy rail was used in the tunnels over 30 years ago, I see no reason why it can't used again.



'Tram-Trains' do exist and are used in a couple of places in Europe - but the government wouldn't be willing to take a risk on them until they are proven technology.
But they are prepared to go Maglev.