Description
The R10 introduced many innovations, including "SMEE" schedule braking, which introduced dynamic braking. Dynamic braking reduced wear and tear on brake shoes, reducing maintenance costs. Improved propulsion, in the form of four 100 horsepower (75 kW) traction motors instead of the traditional two 190 hp (140 kW) motors (the setup used in the R1-R9 car contracts) improved acceleration from 1.75 mph per second to the current 2.5 mph/s. R10s were also the last NYC subway cars ordered with air-operated door engines. Although they could, and occasionally did, operate in mixed consists of later SMEE cars, the R10s for the most part ran in solid consists throughout their careers.
For the first time, the car body was of an all-welded low-alloy high tensile (LAHT) steel construction. This gave the body great strength, as the body and underframe were welded together to form a single, durable and rigid car body which had strong structural integrity.
Read more about this topic: R10 (New York City Subway Car)
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