--- In STMFC@yahoogroups.com, "al.kresse" <water.kresse@...> wrote:
I think I remember reading something about limitations in train length
due to air brake performance. Not sure where I read it, but I thought
the PRR, prior to WWII, had train length limits for K brakes because
of concerns over the speed/effectiveness of air brake applications in
long trains. Can't remember where the rule came from (I think it was
100 cars) - could be regulatory, or could have been self-imposed - the
PRR had a few nasty runaways on the east slope just west of Altoona in
the early 1900's. My aunt (born in Altoona in 1920) remembers several
incidents as a child where runaways would crash into Altoona. Her
father was a PRR shop foreman, so I think her recollections were
likely accurate - my grandfather was a dedicated PRR employee (57 years).
I think the rule was relaxed as AB brakes came into use - and I
thought I remember reading that the train limit could be exceeded if
less than some percentage of cars were K brake equipped.
Could take me a while to remember the source of this. Anyone else?