What are the speakers mainly discussing?

M: Fancy seeing you here. I didn’t know you rode the subway.
W: I’m fed up with driving and paying so much for gas, and the buses are crowded and unreliable.
M: Yeah, I really appreciate taking the subway! From the Scott Street station, it’s only half a block to our office. And going home, the 52nd Street stop is only two blocks from my apartment.
W: Plus, the trains leave every 5 minutes, so if I miss one, I don’t have to wait long for another.