I heard there were large ones in NY, but I’ve seen some large ones in LA as well. I don’t like rats!
I’ve seen some large ones in NYC, but usually scurrying away under something or rummaging around on the subway tracks.
We had one that used to invade our office when I was working with Sanitation (yes, irony is ironic) that the guys who worked between 6 and 8 used to see. They finally trapped that one and disposed of it.
I’ve often wondered if one of those clever robotics firms could create a thing that could roam the tunnels and inject any rats it found with poison. Just one of those random fantasies I’ve had that might make an interesting sci-fi plot.