Wasn’t the rail-based system supposed to do something similar with an absurd number of TEL railcars, of which only a small percentage would actually be loaded?

Rail was for Peacekeeper with 2 missiles per train (and built in ABM defense as I recall with LoADS). The one you’re thinking of is the shell game concept (don’t recall the “official” term off the top of my head). It would have had 200 Peacekeepers each on a giant mobile vehicle (1,000,000 lbs+ with 8 foot tall tires) shuffling it’s missile between 23 shelters. For a total of 4600 hardened shelters. 😮