The B Division is a division of the New York City Subway consisting of the lines whose services are designated by letters, as well as the Franklin Avenue and Rockaway Park shuttles. These lines and se
New Technology Train, common on the subway. Note the four sets of doors per car, a feature of all current B Division trains
The A Division, also known as the IRT Division, is a division of the New York City Subway consisting of the lines whose services are designated by numbers and the 42nd Street Shuttle. These lines and
B Division (New York City Subway)
…Subway System (IND) prior to the 1940 city takeover of the BMT. The B Division rolling stock is wider, longer, and heavier than that used on the A Division measuring up to 10 feet (3 m) in width and 75 feet (23 m) in length, compared to 8 feet 7+3⁄16 inches (2.621 m) in width and 51 feet (16 m) in length…
New Technology Train, common on the subway. Note the three sets of doors per car, a feature of all current A Division trains