Bob Bruce is and has been one of our most prolific builders. He continually combines and modifies our kits into something new and different as you can see here. If you look closely, you will find parts from not only kits but textures too. Great job Bob.
Bob says, it is O scale. The right building is the right front of the Wood & Steel Complex printed twice, once in reverse, and joined at the center. The tanks are wrapping paper rolls wrapped with your TO-344 (printed at 60%) The sides of the building are made slightly deeper with bits of front wall. The tank cars are also Clever Models, from your Critters collection.