In the late 1930s, the Brooklyn-Manhattan Transit Corporation rebuilt 90 turn-of-the-century wooden elevated cars for service to the 1939-40 World's Fair. Steel ends replaced the original open wood platforms and the BMT shops installed new doors and control systems. The cars were semi-permanently coupled into three-car sets, with two motorized units flanking an unpowered trailer. The Q (for "Queens") cars served on the Flushing Line until 1949 and the following year began a new career on the Third Avenue Elevated. Like the proverbial phoenix, the cars - now more than half a century old - began yet another life in 1957, when they were moved to the Myrtle Avenue Elevated. When the Q-Types were finally retired in 1969, the oldest cars had been in continuous service for 66 years - the longest career of any New York City transit car. Today you can see a preserved Q-Type in the New York Transit Museum, the only rail museum in America located in a former subway station.