Bubble wrap, paper towels, craft foam, what have you.
This set is some Rivarossi Penn Central coaches... Nothing too ornamental there.
I also have a bunch where the equipment is laying on its side and padded top and bottom.
When you have it closed up and everything is padded in, you can line them up on a book shelf and label the spine. Excellent for Pike Size Passenger Trains.
You should be able to order these things on line. That's where I got them. Ebay, I think. Search VHS storage
Lee