Is there any city with ONE good rail line that doesn't evolve into a messy larger system? Here's what tends to happen to non-legacy systems like Houston or Dallas (though I'm sure there are others).

>First Line built after years of lobbying
>Surprising success, connects several destinations, attracts people who never would've ridden transit
>Ridership per mile is great
>City reacts to First Line's success by building new lines
>Second Line, Third Line, Fourth Line, Fifth Line get eventually greenlit and built (or a First Line extension)
>These lines don't have nearly the right destinations or places that made First Line a massive success
>Second/Third/Fourth/Fifth Line can't get additional people onboard, only replaces bus routes and cannibalizes bus ridership
>Cost of entire system rises, ridership per mile plummets, resistance builds up
>First Line (or at least the original segment) continues to do well but it barely holds up the rest of the system
>Entire rail system goes from a great example of how rail can be used well to a cautionary tale