Tokyo, NYC and London all run subway trains during peak hours within 2 mins. That’s almost certainly better than what the Boring loop achieves.
And these are subway systems. What you would run would be an autonomous light rail system with 1-2 cabins like you see running in airports all over the world.
It's very, very difficult to run trains with headways of under 2 minutes (as in, under two minutes from one train closing doors to the next train closing doors). The record holder is apparently Paris Line 1 at 85 seconds during peak hours, and some lines of the Moscow Metro do 90 seconds.
The latency is likely lower since you don't need to look for parking.
Slightly off-topic: The current Tokyo subway system has the unfortunate property that it turns off between midnight (~0) and early morning (~5). The Loop thing wouldn't have this likely, but I don't understand why Tokyo does this, especially for the trains that don't have a driver.
Maintenance is far easier when you don't have live trains running. If anything, NYC is an outlier for having 24 hour services, and it shows in their abysmal on-time record.
Tokyo, NYC and London all run subway trains during peak hours within 2 mins. That’s almost certainly better than what the Boring loop achieves.
And these are subway systems. What you would run would be an autonomous light rail system with 1-2 cabins like you see running in airports all over the world.