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I cannot say anything about "when this became the
norm", but the Virginian was using load & empty brakes in the 1920's on
their coal trains. For example, their battleship gons were built with these,
but earlier Virginian gons had load & empty brakes as well, so the
practice predates their battleship gon fleet.
- Claus Schlund
----- Original Message -----
Sent: Tuesday, July 01, 2014 5:12
Subject: [STMFC] Empty/load sensor for
I’m reading a technical article describing the problems
inherent to the different air pressure needs of brake equipment on empty vs.
loaded cars and the described solution is a slightly larger auxiliary
reservoir, a small reservoir attached to the brake cylinder, and a
simple load/empty valve whose position is determined by how far down the truck
springs are compressed.
The explanation for the different needs of loaded vs. empty
cars and how the problem was solved are clear enough by it doesn’t say when
the idea was adopted by railroads. I’m wondering if this is a modern
solution or something that was rolled out and used in the steam
The explanation is here: << http://www.alkrug.vcn.com/rrfacts/brakes.htm>>
and may be found about 60% of the way down the page.
Anyone know when this became the norm?