The R179 is a class of 318 new technology (NTT) New York City Subway cars built by Bombardier Transportation for the B Division . The cars replaced all remaining R32s and R42s . The R179 is similar to the R160 and R143 but it runs on the A , C , J and Z lines . The R179 order originally contained 208 cars that were each 75 feet 23 m long . In 2010 -2014 Capital Program , the order was changed to 290 cars that were 60 feet 18 m long - similar to the car lengths of he R143 and R160 cars - with options for up to 130 more cars . The majority of the R179s wre supposed to be in 300 - foot - long 91 m five car sets because the R179s will be replacing the 75 foot long R44s, which will be arranged in 300 -foot- long car sets.The R179s have two doors at each end of each car and the R160 has the same too.