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The #6s are much cheaper. It will require some re-arrangement, but the overall plan should remain the same.
Really? Crap. There's a double grade crossing in there that will set the track spacing. I don't know if the #4 or #6 crossover will match that. It's probably based on the double crossover which is made up of #4s. I'd hate to use the double crossover because there's nothing like it anywhere near Apex.
Yeah, that double crossover is a 50% savings over the 4 switches it would take to replace them in a standard crossover configuration. Maybe that's what I'd do... Keep the 4s on the inside passing siding and the siding pairs, keep the 6 for the pit track, and replace the crossovers with a double crossover piece back where you put it. It ain't prototypical, but honestly, it's kind of a fun and interesting piece of track, and this is again for my son's play value rather than as a no-kidding model of a prototype.