I'm trying to design a diorama of a train carrying one of the German big guns - Karl or Leopold, and without being inaccurate get a reasonable number of kits in a given area. So the question is how were trains assembled in the yard. I'm assuming a BR-52 or Armored steam engine would pull the assembled train, and maybe a small diesel might be moving the cars around into an assembled train. So could the Br-52 be on one track with part of the train while the diesel is on parallel tracks moving individual or sets of cars to add-on, or cars being loaded with supplies - soon to be added to the assembly. In connecting a car to the freight would the small diesels move them up for connection to units already connected to the big steam unit or would the total train be assembled and then the steamer connected. There must have been some typical concept of operations in the yards - which I'll bet is different from the way US trains operated during that period. Thanks in advance for any suggestions.
Val Kraut