page_title: ACMU
hierarchical_section_title: ACMU
caption_attribution_description: English: A Metro North Commuter Railroad 1100 series ACMU at North White Plains in the winter of 2004.
context_page_description: The ACMUs were a series of electric multiple unit railcars built for the New York Central railroad in three orders between 1950 and 1965. The ACMUs were intended to replace/supplement the original fleet of heavyweight MU cars, some of which dated to the start of electric operations on the New York Central. These were the first New York Central units to offer air conditioning, with sealed windows replacing the drop sash and clerestory types found on earlier cars. The initial set of 100 cars was retired in 1970, upon completion of the M1 railcar delivery, while the second and third orders, totaling 87 cars, remained in service until 2004, when they were replaced by the new M7 fleet.
  An order of near-identical cars was built for the Long Island Rail Road as the class MP75 in 1963. The LIRR cars were eventually converted to non-powered push-pull coaches before being retired in the late 1990s.
context_section_description: The ACMUs (short for Air Conditioned Multiple Unit) were a series of electric multiple unit railcars built for the New York Central railroad in three orders between 1950 and 1965. The ACMUs were intended to replace/supplement the original fleet of heavyweight MU cars, some of which dated to the start of electric operations on the New York Central. These were the first New York Central units to offer air conditioning, with sealed windows replacing the drop sash and clerestory types found on earlier cars. The initial set of 100 cars was retired in 1970, upon completion of the M1 railcar delivery, while the second and third orders, totaling 87 cars, remained in service until 2004, when they were replaced by the new M7 fleet. 
  An order of near-identical cars was built for the Long Island Rail Road as the class MP75 in 1963. The LIRR cars were eventually converted to non-powered push-pull coaches before being retired in the late 1990s.
caption: ACMU at the North White Plains station in 2004.
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