If you are using the MHC cars (ex. http://walthers.com/exec/productinfo/932-6021 ) they can be placed either at the front of the train or the end. The baggage car is almost always placed as the first car after the locomotive. However, if you are using the Box cars (ex. ExpressTrak, Road Railers, http://walthers.com/exec/productinfo/932-6045 ) those need to be placed at the rear because they are not equiped with HEP components that transfer the HEP from the locomotives to the passenger cars.Also, would baggage/material handling cars be at the front or rear of the train?