Joe, the two track plan with the crossover switch is accurate. You wouldn't see a separate building for milk cans though. The creamery would have two loading docks, one for offloading the full cans and one for stacking the empties, both attached to the main building. A small creamery would only handle cans for both recieving raw milk and shipping out pasteurized milk. A larger creamery would have a tank that stored the finished milk. You'd then have three operations, one for loaded cans, one for empty cans, and a pipe loading spot to fill glass lined milk reefer with liquid milk. In the 1920's, this was about as big a most creameries got, since the finished milk would be shipped to other plants from making things like cheese and yogurt. Bordens revolutionized this whole process by building the first integrated plant in the late 20's, where raw milk was received and finished products, like pasteurized milk, cheese, cottage cheese, and whey products were all shipped out from the same plant. It really depends on how much room you have. On most home layouts. the receiving creamery with the two track layout is about as big as you have room for. The first Bordens plant had a five track holding yard, a number of different plants, and their own switcher to shuffle cars around. IIRC, they had over a mile of plant trackage. As you can see, you can make a milk operation as small or large as you please and have space for.