I currently manufacture storage boxes to protect and make packing/unpacking of your loco's and stock quicker and easier.
I have boxes in N gauge; holds 28 loco's, coaches or numerous stock. 2 types for 00 gauge - type 1 holds 7 loco's, coaches but is not quite big enough for Tornado & tender, type 2 holds up to 20 wagons. and my 0 gauge has 3 compartments big enough to fit a 57 foot coach.
All my boxes come complete with plastic box and foam inserts, removed foam can be cut to fill any gaps left by shorter items.