Some might find this interesting: due to a combination of one-time variables, it is entirely possible the Bay Area yesterday had the nation's busiest light rail system and third-busiest heavy rail system.
Due to the Giants' victory parade in downtown SF, BART had
568,061 exits and Muni Metro (light rail) had over
250,000 exits. Due to this week's storm surge, New York wasn't running trains yesterday. The most recent
APTA report has DC and Chicago with higher average weekday riders on their heavy rail systems, Boston heavy rail at 540k and Boston light rail (which is normally the nation's busiest system) at 248k.