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Re: What exactly IS SMEE?

Posted by Lou from Brooklyn on Wed Oct 13 11:41:57 2021, in response to What exactly IS SMEE?, posted by MorningsideHeightsM100 on Wed Oct 13 09:31:30 2021.

S - Straight Air
M - Motor Car
E - Emergency
E - Electropneumatic

S - Straight Air or trainline which braking effort is proportional to the difference between trianline and reference pressure

M - Motor Car car has motors, compressor, reservoir, brake valve and is not a trailer car

E - Emergency or failsafe unlike streetcar a way to vent the brake pipe to atmosphere for an emergency stop. At BERA we have SME without the emergency on some of the streetcars.

E - Electropneumatic or electric trainline circuits, unlike above with streetcars at 600ft train you need an electric circuit or you wouldn't have uneven or even unresponsive braking. NYC Subway cars I think they call it the R wire?


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