I mean, you could say this of many if not most cities, I would think, for at least some part of the transport system. I can see elements of this from my office

I mean, you could say this of many if not most cities, I would think, for at least some part of the transport system. I can see elements of this from my office window: https://en.wikipedia.org/wiki/Dublin_and_Kingstown_Railway https://en.wikipedia.org/wiki/Dublin_and_Kingstown_Railway - it's almost 200 years old. Still carrying a train every few minutes at peak times. (Obviously a bit of a railway of Theseus at this point, in that besides some of the bridges there's ~no part of it which is literally from 1832.) This thing is kind of weird in that it's apparently basically been the same route since completion (most old railways ultimately become part of larger systems), but there are other examples; I'm fairly sure that the Glasgow Subway route is ~exactly what it was in 1896 today, say.