So something that I found curious about the rolling stock that came with Sand Patch Grade was the Well Car. Why? Because it is one of a rare length, a 56ft Well Car. Now from what info I can gather, these well cars were specially made for UPS, to carry 4 28' containers in a single car. However, Its very hard to find real photos of them (Had to dig thru RR Picture Archives to find any photos),and I couldn't find one with the full 28' set, though there's plenty of photos of the Athearn HO Scale model ones. So, it just seems like an odd choice of a well car to be put into Sand Patch Grade for a car that is rarely seen on the rails, compared to a 53', 48' or 40' car.
An easy way to make a freight train longer without adding extra resource sapping wagons? Go for the longest wagon available.