MTB routes by train?

I was just thinking out loud to a mate earlier, can anyone recommend some really good trail/xc riding, with the specific requirement that it be within a few miles ride of the main rail network? I'm thinking it'd be a nice way to spend a day, just jump on the train at edinburgh, ride it for a few hours to somewhere new, jump off and ride... I can't drive, so can't just get in the car and go, so here's the credit crunch alternative 
Any suggestions? Fort William is 5 hours away, but with the train times it'd have to be an evening ride and an overnighter which isn't ideal really... Could go and do Glasgow's Pollok park red and blue routes I guess?

Any suggestions? Fort William is 5 hours away, but with the train times it'd have to be an evening ride and an overnighter which isn't ideal really... Could go and do Glasgow's Pollok park red and blue routes I guess?
Uncompromising extremist
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H.G. Wells.
I did Calendar to Aberfoyle and back on New Years Day, and it was an experience, to say the least!
http://www.cycle-n-sleep.co.uk/rinfo/ma ... rlisle.htm
Dont think Pollock Park is really worth commin all the way form Edinburgh. Its small tracks which you could get round in 20mins and thats combining all them!
Best bet Carron Valley
VOODOO CANZO
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Lots of ideas there, thanks a lot folks!