When is the last time you carried five pieces of plywood with you on the train returning home from the hardware store?
I’m not saying I would carry plywood on the train. I’m saying the train is perfectly capable of carrying plywood to your local hardware store or lumberyard (mine is only about 2 mi. away, vs. 15 mi. to the nearest big box), where you can pick it up. In fact, that’s how things were done until very recently.