We always make a transport and storage box for my locomotives and my own coaches / cars. I have attached a few pictures to show some of the details. They are made from "Baltic Plywood" which is supplied in various common thicknesses and the standard sheets are 5 feet square. The plywood is finer than most and is sometimes refered to as Modellers Baltic Plywood. The fittings can be bought at most hardware stores here in Canada or by mail order from Lee Valley Tools
http://www.leevalley.com/
Once the outside box is comlete I hand it over to my wife who stains and varnishes the outside before lining the inside. The box is sized so that when lined with 1 inch lining of foam on the sides, ends and top the loco is gently secured. After Phyl has glued in the foam she then attaches the velvet material to the box which allows it to move over the foam without becoming tight. After a couple of days the loco seats itself into the foam as can be seen.
For coaches / cars we make a series of boxes that stack coaches 4 wide and 3 layers high. Each layer is attached to the one above using similar clasps to those on the loco boxes. Boxes are varnished and lined in a similar maner.
Royal Hudson Box (No carrying handle because of weight of loco)
Mallard and Flying Scotsman boxes