LibDems? What's that?
Labour might do it, particularly if they're going back into Old Labour territory which Millibands 'One Nation' speech seems to indicate that they might, but the Tories definitely won't, it runs against everything they stand for and would mean that their great grandmother Maggie was wrong to privatise them. It would be a political disaster, more so than the railways collapsing which they can just play the blame game on the economy for.
Never mix common sense and politics Tribesman, you know the two very rarely go hand in hand
Most governments don't think ahead further than the next election anyway.