There are a lot of stations (numbered lines only, I think) that have "time to next subway" signs which I've found to be pretty accurate. I'm not sure if there i

There are a lot of stations (numbered lines only, I think) that have "time to next subway" signs which I've found to be pretty accurate. I'm not sure if there is an API for subway info, but they run so regularly (~5 mins or less during the day and 30 mins at late night) that it's generally not that important to get that info. I'm not going to take a taxi because the subway is 15 mins away.