i really really like steam trains. such cool locomotives of the past, blowing steam out too. if i'm not mistaken, i believe that steam locomotives work when a fireman shovels the coal into the loco's firebox, then water comes from an enjector, then that water is heated, which creates steam, then that steam goes to the boiler, where it ends up at the rods, then that makes some kind of spinning force or something and then bang, choo choo!! (i don't think this is correct though. i'll have to do my research a little bit more if this is incorrect)