Nice work everyone. I like the roofing granules idea. I priced it out and found stock in a 5 gallon bucket of IKO brand in grey. I have a ways to go until I will be ballasting however! Tonight after the kids went to bed I cut two 16” pieces of plywood to go on either side of my twin arch bridge.
My original plan was to have two arch bridges in a row , but after much testing with the bigger locos in particular the Big Boy, my layout is about 5 “ short in order for me to have enough straight clearance before going onto the bridge from the O72 curve. It was a disappointment as the twin bridges were going to be a key focal point. Anyways, I’m over it and working away on the upper level. Bench work is now roughly in place for upper level and next I will fit the track and test the larger rolling stock again for clearances. Here are some pics: