The M1 and M3 are two similar series of electric multiple unit rail cars made by the Budd Company for the Long Island Rail Road, the Metro North Railroad and Metro North's predecessors, Penn Central (whose predecessor, the Pennsylvania Railroad, operated the LIRR) and Conrail. Originally branded by Budd as The Metropolitans, the cars are more popularly known under their model names, M1 (late 1960s/1970s cars) and M3 (1980s cars). The proper name for the Metro North series are the M1A and M3A respectively though they are colloquially called by the main LIRR designations for the sake of simplicity.
