I like how the Vegas Loop tunnels are almost the same diameter as the London Underground deep lines. Glasgow subway is even smaller. Which means the tunnels are big enough to run metro and carry lots of people.

It would be better to use larger tunnel, buy normal sized trains, and keep tall people from hitting their heads. It would also make sense to use one of the automated systems instead of trying to build pod system.

It is also curious that Musk always want to do his way. Cause there is company that makes automated pods used at Heathrow. They should work for the current service and wouldn't be Tesla 3 with driver.