I am fine tuning my planning for my layout In a 50's to mid 60's ERA I plan to use early piggyback concepts in a small TOFC yard. In researching what types of cars and trailers were used and how they changed I decided to create a yard that ships delicate material from a local factory on my short line to connect to several major RR that have different types of TOFC or early COFC operations. I will build the yard to handle chained trailers, circus loaded hitch mounted trailers, circus loaded flexi van clejan, circus loaded (basically a track for 2 or 3 of each type) the narrative is that reduced handling in specially cushioned trailers offers a way to get material door to door, and the yard has been built to serve those different main lines are there more possibilities? I'm limiting my choices to before 1965. I'm planning on through trains coming from staging to the big yard and getting split up with local cars added to go to different destinations back in staging, with a small number of each type of TOFC coming and going to local businesses. I will also have some local to local movement, sand and aggregate to redi mix; logs to sawmill, wood chips to power plant: bio diesel to fueling area etc.