The M1's were delivered between October and November 1968 before the first revenue using the new cars on December 30th, 1968. They even had the motto, "14 by Halloween."
First revenue M1: Babylon Branch.
First revenue M7: Long Beach Branch.
First revenue M9: What branch do you think will get lucky?
This is the train to (NYC). Stopping at: Babylon, Lindenhurst, Copiague, Amityville, Massapequa Park, Massapequa, Seaford, Wantagh, Bellmore, Merrick, Freeport, Baldwin, Rockville Centre, Lynbrook, Valley Stream, Jamaica, Kew Gardens, Forest Hills, Woodside, Penn Station OR Grand Central.