|Shawn Branstetter wrote a SBS titled “Detailing a Wood Timber Grade Crossing” for Shortline Modelers. He used … for his 75 pound or code 100 rail in O scale. His timbers started out at 5 inches by seven inches wide. He is modeling P48 so this means he had around 42 inches width between the crossing timbers for his road surface.
Her’s the grade crossing as created by Shawn Branstetter
I’m modeling On30. My crossing timbers will be made using On30 switch ties. Each is .110 inch high by .140 inch wide. That is 5-1/4 inch by 6-3/4 inches wide. On30 has a gauge of 16.5 mm (0.65 in). That is 31.2 inches full size. Subtracting two tie width from that (6-3/4 inch x 2 = 13.5 inches) and we get 17.7 inches. The question then is .. would it make more sense to fill that 17.7 inches with timbers (that would require ripping ties to fit and angle cut in the center. I don’t think that the track gang would have thought too long about it .. much simpler to tamp asphalt into the areas around and between the timbers.