Today my second suggestion is the London Underground Central Line. This suggestion covers the entire route from termini at West Ruislip and Ealing Broadway in the west to Epping in the east and also including the Hainault loop. There are 3 depots at Ruislip, White City and Hainault. Stock would be 1992 Stock units. The units could also be used as AI and static fillers elsewhere such as Ealing Broadway on GWE.
I think it would be better with something overground instead of sitting in a tunnel for like the entire ride
A large portion of the Central Line is open air, though. In fact go back a few years and you could even include the Epping to Ongar section when it was still operated by LT, as they were then.
A large amount of the route is open air. Only Shepherds Bush - Mile End and Wanstead - Gants Hill are underground
This line runs automatic train operation if you are not used to braking Curve Pulse Code Signal system of the 1992 Stock will Stop Signal Overrun which is the American term for signal passed at Danger SPAD every single time. Details on how the system works on the central line check this website by Clive Feather
