Rail Guns for Space Travel

Do you guys think it would be possible to launch a typical sized space shuttle using some kind of rail gun technology with the energy sources we have today (like nuclear power). If so how fast do think it could be done?

I don't think this would work for earth because I don't think anything we could build would be able to withstand the forces of atmospheric friction at 7miles per second.  As for making one on the moon, it would be possible, but I'm still not sure how I feel about launching something at ~1MPS.  if it hits *anything* it would be obliterated.  even in the case that all we are launching is raw materials, obliteration means that your nice slug of a projectile become a wad of shot headed towards earth and all it's satilites.  not a plesant thought.