Dating a close friend

Here's the scenario: They've known each other for a couple of years and are really good friends. They share the same social energy (by that I mean, they both love going on nights out drinking, going to parties and bars, etc.), share the same humour and there is obvious sexual tension. She has one year left at uni, he's already finished uni and looking for work. There is a 2 hour train journey between them. One of them has already had a failed long distance relationship. Does this kind of thing last? Will it last because there's already a good grounding from the friendship...or will it eventually start to crack after the fun has been had?

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