There are no examples in the world of them being used within cities.
I could imagine a high speed loop of some kind around the entire 100 mile bay, with say 10 stops.
A 50 mile segment would take 33 minutes at 150 miles an hour with no stops, but there would be 5 stops in this case. It takes multiple miles to reach 150 mph and multiple miles to slow back down from that speed, plus a typically mandated doors open time of 30 seconds. We can easily estimate an additional 2-3 minutes per stop.
So high speed train portion would alone be in the order of 40-45 minutes.
That leaves 3 legs unaccounted for - getting to and from the high speed terminal at each end, and walking to and from the local transit. Given wait times and walking it would be generous to call those 15 minutes each.
That takes us to 1hr 15. The train cannot get you there faster than the car, unless you live next to the terminal and your destination is next to the terminal.
This is in the situation where we build a completely new kind of local train that accelerated to 150 mph between stops.
Musk’s hyper loop might do it. But no hyperloop has ever been put into production yet.
This shows that the problem is density and lack of available technology, and not anything to do with bad management.
The above is commonly done in the world.