What do you mean by notable?

Only that they are worthy of noting. If there is a modern system, but it happens to suck for some reason, you don't have to mention that one. So feel free to strike that "notable". Which American cities have modern train systems?

Ok, that's an unusual definition of notable.

notable

adjective

no· ta· ble ˈnō-tə-bəl for sense 2 also

1 a : worthy of note : remarkable

    | a *notable* improvement
https://www.merriam-webster.com/dictionary/notable

I misread that you were retracting "notable" and replacing it. I thought you were adding "it can't suck for any reason" to your definition.