Been experimenting with things in formation designer , I found some things to share ,Most cars are emptys but if you have the HSC horseshoe curve route if you choose the NS Bethgon coal hopper it gives you a choice to spawn a cut of 5 loaded coal hoppers this way you can do a loaded unit coal train or have a cut of loaded coal cars in your created trains. Also found you can spawn a cut of 15 center beam empty lumber cars at 1 time , and spawn a 50 car cut of SMH reefer cars to help build a train quicker ,, dont neec all 50 just uncouple the cars you dont want and delete etc .