The Endless Belt Trains for Futuristic Cities described in the November, 1932 ish of Modern Mechanix is one of my all-time favorite tomorrows of yesterday -- a world run on rails, rising high above the city, slicing through it with arrow-straight, improbable lines:
Passengers board the first local train at any point, and it stops every 50 seconds for a period of 10 seconds. When the doors close, a gong sounds and the local platform starts moving. Now there is another signal and gates open for a second platform, or express, on which the passenger takes the major part of his trip. After ten seconds the gates close and the local slows down for another stop, while the express picks up to a 22 m.p.h. speed.
Noise of the system is at a minimum, and passengers are delivered at no more than 300 feet from their streets. All stations are controlled from one central point, all elements being so timed that there can be no hitches.