Overview
As of January 2012, there are 6,293 cars on the NYCT roster. Train assignments can be found here: A typical revenue train consists of 8 to 11 cars, although shuttles can be as short as two, and can range from 150 to 600 feet (45.72 to 182.88 m) long. As a general rule, trains on A Division lines inherited from the IRT (designated with numbers, plus the 42nd Street Shuttle) are shorter and narrower than those that operate on B Division lines inherited from BMT/IND (designated with letters). The A Division and B Division trains operate only in their own division; operating in the other division is not allowed. This is mainly because the IRT sections have narrower tunnel segments, tighter curves, and tighter platform clearances than the BMT/IND sections. IRT Division trains would have an unacceptably large gap between the platform and train if they were allowed in the BMT/IND Division. Likewise, BMT/IND trains would not fit in the IRT tunnels and stations. The safety train stop (trip cock) mechanism between divisions is also incompatible, being located on opposite sides of the track and train in each division. Service and maintenance trains are composed of IRT sized cars, do not carry passengers, and can operate on either division as the safety train stop is built on both sides of the trucks.
The system maintains two separate fleets of cars, one for the IRT lines, another for the BMT/IND lines. All BMT/IND equipment is about 10 feet (3.05 m) wide and either 60 feet 6 inches (18.44 m) or 75 feet 6 inches (23.01 m) long whereas IRT equipment is approximately 8 feet 9 inches (2.67 m) wide and 51 feet (15.54 m) long. There is also a special fleet of BMT/IND cars, used for operation in the BMT Eastern Division, which is the J, L, M and Z trains. The BMT Eastern Division has sharper curves and shorter platforms, so these trains can only use eight 60-foot (18.29 m) long cars. As of August 2011, R42 married pairs, R143 four-car sets and R160A four-car sets are assigned to the BMT Eastern Division. 75-foot (22.86 m) long cars, like the R44s, R46s, R68s, and R68As are not permitted on BMT Eastern Division trackage.
Cars purchased by the City of New York since the inception of the IND and for the other divisions beginning in 1948 are identified by the letter "R" followed by a number; e.g.: R32. This number is the contract number under which the cars were purchased. Cars with nearby contract numbers (e.g.: R1 through R9, or R21 through R36 WF, or R143 through R160B) may be virtually identical, simply being purchased under different contracts.
When the Brooklyn Rapid Transit Company entered into agreements to operate some of the new subway lines, they made the decision to design a new type of car, 10 feet (3.05 m) wide and 67 feet (20.42 m) long, the subject of several patents, whose larger profile was more similar to that of steam railroad coaches, permitting greater passenger capacity, more comfortable seating and other advantages. The BRT unveiled its design, designated BMT Standard, to the public in 1913 and received such wide acceptance that all future subway lines, whether built for the BRT, the IRT or eventually, the IND, were built to handle the wider cars.
When the R44s and R46s were rebuilt, the rollsigns on the side of the cars were replaced with electronic LCD signs while the front service sign remained as a rollsign. In sharp contrast, the rebuilt R32s and R38s retained rollsigns on the sides, but a digital light display was placed in the front. The MTA has been incorporating newer subway cars into its stock in the past decade. Since 1999, the R142s, R142As, R143s, R160As, and R160Bs have been added into service. All cars built since 1992, (including the now out-of-service R110As and R110Bs) are equipped with digital signs on the front, sides, and interior (except for the R110B, which has rollsigns on the front).
Old cars, some from the original companies (IRT and BMT), are preserved at the New York Transit Museum, while others have been sold to private individuals, rail and trolley museums. Between 1984 and 1989 some of the IRT trains were painted red, giving them the name Redbirds. Since then, all of these cars have been replaced by more modern subway trains (R142/R142As) between 2000 and 2005. As of July 2010, many older BMT/IND cars (R32, R38, R40, R40A/M, R42, and R44) have been retired and replaced with the R160s.
Read more about this topic: New York City Subway Rolling Stock