Dr Gerbil-Fritters,
If you put the tank car loading on the aisle instead of the dock that's on the right side of the plan, You can use the area that's presently used for the tank car unloading as a factory of some kind (I would suggest furniture factory) so that you can run an assortment of cars in and out such as box cars (lumber, hardware, stuffing, fabric, etc.), flat cars for lumber and piping (furniture framework), gondolas/coil cars (for coiled steel and the same loads as the flat cars), tank cars (paint, glue, polyurethane, lacquer), and covered hoppers (sawdust for press board, plastic pellets).
Mike