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In page AB Standard (New York City Subway car):

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Braking was tremendously improved on Standards, as electropneumatic brakes synchronized the braking effort of every car in the train to provide a faster braking response. This newer type of braking, WABCO schedule AMUE, would be standard in New York's subways through the 1930s, and lasted in limited quantity until as late as 1977 (when the R1-R9s, the last of the prewar cars, were retired from service). Additionally, a "Variable Load" feature automatically adjusted each car's braking effort to compensate for uneven passenger loads in different cars throughout the train. The result was a smooth, uniform braking effort that increased passenger comfort.