Don’t forget, it was Jimmy Carter who authorized the Peacekeeper Rail Garrison and Reagan who killed it!
The Peacekeeper Rail Garrison wasn’t going to run on civilian rails. It was going to have many 20-mile long rail lines and the missiles would shuttle from “station” to “station” on that limited rail line. There was about a 20:1 ratio of dummies to real missiles. The dummies had the correct weight, size, and electromagnetic signature to match the real missile cars. The system was even going to have locations where the Russian satellites could monitor the missiles.