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And for giggles I installed a working signal (replacing the non-functional plastic one on the original) that's very retro, with big, old-fashioned grain-of-wheat bulbs. Alas, it has Classic Modeling Mistake #123: traffic light color arrangement (red on top, green on bottom, instead of the reverse).
Question, though... does the main oval raise up along the back side? To the level of the coal spur?
If so, what do you figure that grade works out too?
Measured it directly with a digital level: 5.8%. Made worse by the fact that one of the curves looks to be around 6.5" radius...
Double yowzer!!