This is a design based on S. Savard's 40 foot container. I rebuilt the file to a 48 foot version to fit my 48 foot well cars. It is in N scale. It scales to 48 feet and a few inches depending on your resin shrinkage at curing. It has the magnet wells for stacking. 4 or 5mm diameter disk magnets work well. Another "hats off" to Stephane for his original work.