Replying to East portal, Moffat tunnel

I was blabbing with some ski coach I met on the lift about how you could possibly tour from Eldora to Winter park. He told me about this train tunnel (Moffat tunnel) that went under the continental divide, and that apparently only the ski train goes through it on scheduled intervals. Apparently (emphasis on apparently) there were some dudes who hiked through it at night and made it to the other side. Is this dude yapping nonsense or is this actually possible?