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Actually, thanks for pointing out what you say some consider trivial: You Wrote: "By the way, "double track" means current-of-traffic running, either dark or ABS signaled, one-way only, e.g., northward on one track and southward on the other. "Two main track" means that it is CTC, either way on either track, both tracks signaled in both directions. It may seem like a trivial distinction, but it is not. It's a piece of nomenclature that has strict meaning in railroads and among railroaders." I didn't know this, and I've been rambling on for years saying "double track mainline" for the CSX line passing through Rochester. So it's "two main track". Everyone can learn something from anyone!
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