After much experimenting, I have settled on using rolling tool boxes from the hardware store. These are the kind with wheels. They will hold a complete train including the engines.
I wrap all of the equipment in either white hand or face towels depending on the equipment size. I get the towels at Costco. I wash the towels if they become greasy.
This has proved to be the best and easiest method I have found to store and transport trains.
The original train packing material stays at home.
Joe