Operating Era: 1916-1964. THIS SERIES NOW COMES WITH OUR ONE-PIECE ROOF FRAME. New York Central, Michigan Central, Canada Southern. NYC designed its first installation of all steel house cars to compete with the Pennsy's X25. The NYC 1916 design comprised 6,500 cars from three car builders with three known physical variations, installed on both NYC and Michigan Central. The first delivery, 500 cars in the MC 99500-99999 series had a full end door and somewhat different door hardware from all other deliveries. The doors were taller, the large tack board was off center, a door pull was on the small door and the door track was thinner. . The remaining 6,000 cars had a tight "A" end and differed from one another only in the style of trucks and the position and number of door stops. PLEASE SEE OUR STEEL BOX CAR SECTION FOR OTHER #7900 SERIES KITS.