Stand on the mountain in Episode 6!!!
OK! If you know where the train is that passes over the creek and by the bear (the bear that's walking around), closest to the mountains and enters the mountains, get on that train and go to the second to last cart. Stand in from of the second "line" part spot that's on the cart and try to stay there. (I know this'll make your health go down but it's fun) Stay there and when you get electricuted you hit the caboose hatch and you fly up. Move forward and you're on the mountain! It takes a few times and sometimes it won't work but just keep trying. I found it out while running away from Carmelita. Good luck!
Added by: -Lara_Croft- Apr 20th 2011, ID#33579