Originally Posted by
Deltahater
actually, not true...
if you book your ticket on the train, it costs you more.
I had taken it as read that one doesn't board a train without a ticket. In fact quite a lot of train companies will treat you as a fare dodger, and fine you, if they find you on the train without a valid ticket.
If you do not make your train because of the delay of your flight, but you are leaving on the same day/routing, most conductors will let you slide. You may lose your seat, but especially if you pull the tourist card, very few of them will actually make you pay the fare difference
Full-fare tickets are valid on any train, period. It's not a case of "most conductors will let you..."; you are absolutely entitled to travel on any train. If, on the other hand, your ticket is of the no changes/no refunds type then, as others have pointed out, they are not valid on any other train - the only exception being misconnections because of a late-running connecting train. Late-running flights don't count, so if you're arriving by air you should always get a flexible train ticket.