Mike DeBerg,
Was originally looking at sheet styrene for walls,with about 1/8x1/8" wood strips for support. But when the tower on my kraft Mill is about 30" high.I don't know? Never had to consider that much size before. Was just to hobby shop & the 1/8" supports are cheap enough but sheet styrene gets costly fast.
The 20 car train wood be the exception not the norm by any means. In HO,24 car grain trains seemed resonable though I never pulled 1,but in O Scale I need to cut that back to 10 cars being my 4750s&5161s will be normal grain train lengths I'm thinking.
Operations i'm thinking should be heavy near my 50' length of wall, as that will house the yard making train movements there easy to "dispose of" as I can classify them in & out of the yard. That's not my favorite way of movement but O scale changes things due to the increased size.
My emphasis will be heavy on switching industries around the layout not so much on through trains.
Thank you.
Al Hummel
