Animated wheel loader would load each car

[battlearrow]

heres an idea like at seaports it would great if you could some how pull a coal train through 1 wagon at time. at the same a animated wheel loader would load each car with coal,sand,stone or whatever else check out this vid for an insight what i mean

http://www.youtube.com/watch?v=Gcbkt85yp8U

http://www.youtube.com/watch?v=kFvfOVnM30M&feature=related