First get the machine part that was stolen from the power plant ( its in the cerulean city gym) then give the machine part to the guy near the generator in the power plant after that go to saffron city and find the copycat's house ( near the magnet train) and she will ask you to get her poke doll, go to vermillion city and go inside the Pokemon fan club in there a fat guy has a clefairy its a doll talk to the guy and you will get the doll. Finally give the doll to the copycat and she will give you the rail pass!:)
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In Pokemon Gold, the Copycat Girl will give the player the rail pass when they give her a doll. The doll can be obtained from a member of the Pokemon Fan Club in Vermillion City.
in safron city you talk to a girl upstairs in a house about how she likes to copy people and about dolls, then you go to vermilion and go to the Pokemon fan club and talk to the guy with a doll. he gives you the doll then you go back to the girl and she trades you the rail pass for the doll.
you need a Pokemon that can use HM move whirlpool
get all the bags then
first you go see copycat in saffron city and then you go to see the man in the Pokemon fane club and then you go back to copycat and then you get the magnet train pass.