I probably missed the answer to this question, or it may not have been asked, however, I just started purchasing the trains....I bought the locomotive and 2 of the other cars....but when I try to purchase the others, when it says you have to have a certain facility on the farm, and I go to that farm, it's locked....then I go back to the other farm that needs the other facility, it is locked, saying works when attached to the train.....I'm confused.....helppppppp!!!!! Thanks
