in 1948, platforms on the irt broadway–seventh avenue line from 103rd street to 238th street were lengthened to 514 feet to allow full ten-car express trains to platform. previously the stations could only platform six car local trains. the platform extensions were opened in stages. on april 6, 1948, the platform extension opened for stations from 103rd street to dyckman street, with the exception of 125th street.