You ride the train and shoot the bandits who try to rob it.
The intent of the game was to use the "concentration carbonate" sold by the peddler in Rock Ridge, but its application (slowing down the riders) is buggy at best.
only when your doing the train robbery
go to the bank
go to the train station
you shoot them so none of them reach the front of the train
Diamond Plains
I don't know, they're asking you.
The kid with the big head is in Dos Cactos in poptropica wild west island. He is near the sign that says: Train, Shooting Contest.
you leave before the bandits kill you
It will be after the train robbery.
They go in a train tunnel in the middle left
I think once you start riding the train it will tell you instructions and then you just do what it says.
just go in into that one town and just keep going ;)