WMSTR Lifetime Member
Jim once told me there was a difference in the number of spokes in the rear wheels but I forget how many on which engine.I think the Avery that fell through the bridge is an 18 or 20. The big Avery has a distinct curve in the large casting supporting the front of the boiler. also the one on the flatcar, same. Very short pipe between front of preheater and inlet in boiler. You can see the difference on the Avery moving the building. 30 or 40 for sure!