Arch is great if you want to customize your system, but I wouldn’t say it really needs “maintaining” beyond just updating more frequently. (which you don’t even really need to do very often, you just have the option to get newer versions of software.)
Connect them together for efficiency, and maybe use both rails for stability and to reduce design conplexity. (you dont even need any additional infrastructure!) Also, have them arrive regularly, so that users don’t need to bother with an app! Brilliant!
Seriously though, it’s really amazing how people keep inventing trains but worse. I guess this idea makes some sense if there aren’t enough riders for regular train service, but still…