How are batteries cheaper then... no batteries at all? Since the routes are fixed anyway you can attach a cable to the sealing of the tunnel and connect it to the Teslas. You can then drive the Teslas around like slot cars. Requires no charging, weight reduction, no battery degradation and no energy conversion loss.
Why are you so anti-innovation? So anti-progress? There is no reason why the slot car concept cant work. Just plug the car to a long cable. I call it the hyperslot.
Tram lines are far cheaper than having miles and miles of tunnels in a vacuum.
Actual trains can be loaded and unloaded faster, and don't need one driver for every 4 people. In fact, trains have been automated with no drivers for well over 50 years in many parts of the world.
These cars, despite being on an extremely limited access roadway, still can't be trusted to drive themselves. They are literally in the most ideal environment for self-driving. This should be the first place they have self-driving cars.
You need to free yourself from being such a fanboy.
