Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The R42 is a New York City Subway car built between 1969 and 1970 by the St. Louis Car Company in St. Louis, Missouri, serving the B (IND/BMT) Division. This fleet of cars were the first to be fully equipped with air conditioning. The R42 fleet is numbered 4550-4949. It was the last 60-foot (18 m) B Division car built for the subway until the R143 in 2001, and the last model class to be built in married pairs. Thereafter, the New York City Transit Authority (NYCTA), for the time being, switched to 75-foot (23 m) cars for the B Division. On May 9, 1969, pair 4554-4555 entered service on the N train as part of a mixed consist. Between 1988 and 1989, R42s underwent overhaul as a result of deferred maintenance in the New York City Subway during the 1970s and the 1980s. 282 cars (4550–4839) were overhauled by Morrisen-Knudsen while the last 110 cars (4840–4949) were rebuilt in-house by the Coney Island Overhaul Shop in Brooklyn.

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