 On December 30, 1968, the first revenue train of M1 cars departed Babylon for Penn Station.In anticipation, all stations that were still at grade level had their platforms converted from low-level to high-level (an increase of 4 feet) from late-1967 to late-1968 in time for when the fleet went into service.Stations that were still at-grade at the time were Lindenhurst, Copiague, Amityville, Massapequa Park, Bellmore, and Merrick.