The R42 was a New York City Subway car model built by the St. Louis Car Company between 1969 and 1970 for the IND/BMT B Division. There were 400 cars in the R42 fleet, numbered 4550–4949. It was the last 60-foot (18.29 m) B Division car built for the New York City Subway until the R143 in 2001, and the last car model class to be built in married pairs. It was in service from 1969 to 2020. Overhauled in 1988 to 89. Initially, the R42s suffered from air conditioning and brake malfunctions, frequently injuring crew members.