The Lexington Ave line of the NYC Subway is called "The Bullet" by riders who know this route! The #4 and 5 trains easily do 60+ MPH heading up (or down) the express track.
The 14th street station is located on a curve so there is a specially made moving platform to close the gap between the train and the station platform. As the train leaves, it retracts. This system has been used for DECADES in our system! I made this film clip yesterday during my trip to Manhattan for an appointment.