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

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Motorized Standards (motor cars 2000–2899) were built with 2 "maximum traction" type trucks where wheels closest to the center of the car were 341/4 inches in diameter while wheels closest to the ends of the car were just 31 inches in diameter. The motors were attached to the axles that bore the larger wheels. This design was believed to better distribute the car's weight to provide the best adhesion between the wheels and the rails to prevent wheelslip. Unpowered Standards (trailer cars 4000-4049) used more conventional trucks where all wheels were 31 inches in diameter.