Coverage is actually surprisingly wide, just the service level is something out of the 1870s for a lot of stations. The siting for a lot of stations is usually pretty poor as well with terrible/nonexistent walkshed considerations (see the Palm Springs station, try walking to your hotel from that).
Fair enough, I was using "coverage" for actual trips, not nominal rail extent. "Service" is a better description. Your point about siting is very true.
