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Posted by Jeff H. on Tue Apr 25 19:42:41 2006, in response to Re: SMEE, posted by randyo on Tue Apr 25 18:52:25 2006.

Very good discourse Randy.

I will add that on many of these braking systems, such as AML,
AMRE and AMUE, as implemented on NYC transit cars, an
additional reservoir called the supplementary reservoir was
used to provide higher braking pressure in emergency and to
obtain certain features like graduated pneumatic release.

A series of tests and regulations issued around the turn of
the 20th century resulted in the standardization between
manufacturers of mainline railroad air brake products. NYAB
and WABCO were compatible on a component level, e.g. you could
change out a WABCO triple valve with a NYAB and the bolt spacing
and arrangement of ports against the pipe bracket were identical.
Internally, however, the parts were completely different.

This compatibility was not required in the traction world.
I don't think you can take individual components from a NYAB
NEWTRAN operating unit, like an inshot or charging valve, and
apply them to a WABCO operating unit.

Schedule SME braking for streetcars was limited to one motor
car and one optional trailer car. Anything longer and an
automatic system such as AMM was generally used.

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