The minimum recommendations I’ve seen are 3.5” in yards so you can fit your fingers in to lift cars manually. On straights, it’s 4.5” to let trails pass at scale speeds. It’s also the distance of the Atlas dual-track truss bridge and the Ross double-crossover. On curves, it’s whatever your engines need. Many get away with 4.5” there too, but some large scale articulated engines can require upwards of 6” when passing a train with long passenger cars.
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