The train runs between the towns on Wild West island. However, it is not as useful because it only reduces your necessary horse rides by two or three at most. It does not appear until you fix the clock in Diamond Plains. To do this, you need an oil can for the gears in the clock tower.
You get the oil can from the trading post in Dusty Gulch. But you need something to trade. Go to Rock Ridge, and recover the lost calf for the girl rancher at the left side of town (its tracks lead left to the ranch area). She will give you a saddle. You can swap the saddle for the oil can OR the gold pan. Whichever one you pick, you can then swap it back for the other one, because you need the gold pan to find a nugget for the potion peddler in Rock Ridge. To oil the gears, climb into the tower. Oil *only* the center row of gears until they are shiny, then turn the crank.
With the clock fixed, the train will appear at the station. To ride it, you will need the Spud Gun to fight off the train robbers. You can get it by entering and winning the Shooting Contest at the left side of Dos Cactos.
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 ;)