This track basically consists of a bed of white noise overlaid with occasional sounds of footfalls, voices (some comprehensible as PA announcements, others just crowd noise), and metallic sounds (think of a subway train's brakes). It's a pretty good simulation of a subway station with a moderate number of civilians. The footfalls on concrete make it less suitable for a scene taking place in an actual subway car, just to be clear about the setting. In my view, the constant background white noise is a little overdone; it's too loud for my taste, and it doesn't have the rhythmic quality that would simulate the distant rumble of subway trains. Instead, it just sounds like noise, and it detracts from the other sounds. Otherwise, a fine track.