Not sure why this is such a big deal, but may I suggest Those Daylight 4-8-4s by Robert Church?
Starting on page 96 you will see exactly what you want. Freight trains with boxcars and beet cars, skirts and no skirts, and even in pusher service with a Santa Fe set of freight Diesels.
Get a copy, if this is a great concern. It will answer all of your questions.