https://www.youtube.com/watch?v=yLbv6bqiUxo ti sq 1961
https://en.wikipedia.org/wiki/New_York_City_Subway#Capacity_constraints
https://en.wikipedia.org/wiki/New_York_City_Subway#Rolling_stock
A typical subway station has waiting platforms ranging from 480 to 600 feet (150 to 180 m) long. Some are longer. https://en.wikipedia.org/wiki/New_York_City_Subway#Platforms