C.L.
You can take rides on real trains on the Oceolo-something or other rail line from that area, but I'm not aware that it is the kind of thing for a young child's birthday party. There is a train place in St. Paul that does birthday parties for children--it is Choo Choo Bob's or a similar name. The Jackson St. roundhouse just east of St. Paul is a RR museum and might do something for children too.
Cindy