Given your locale, on the real CP line out of Milwaukee, there is a rail transfer site at Watertown. I set up an operation there for my company to handle hydrogen peroxide. I don't know if it was there in the 80's or not. Besides my firm's product in tank cars, they do sweetners in tanks and sugars in covered hoppers. While you have a rather large footprint for such an industry, being in Wisconsin, this site has many covered areas in which to effect transfers free from the disabilities that winter brings. So there would be a steam generator maybe using fuel oil for the boilers (tank cars) and a wash out area to rinse cars.
The site would also handle lumber to use your center beam cars.