An experiment: I made the right-side passing-track crossover a pair of O54 turnouts with a 1-3/4" straight separator. This adds a couple of inches in usable length to the passing-track, and a bit more than that on the length of the storage at the end of the passing track. Since the yard throat is O54 anyway (O72/O54 curved, then a #5), I though perhaps this is not too bad a compromise.
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