Re: Photo: PRR Boxcar 570062 (1941)

Guy Wilber

Bruce Smith wrote:

“Notable features include the short upper door track, 1/3 and 2/3 height door stops, car builder’s doors, plate ends, Carmer uncoupling devices, longitudinal AB reservoir
These all mark it as from the 1st production batch circa 1926."

How does a longitudinally mounted "AB” brake reservoir help mark a car built in 1926 which would not have been built with an “AB” brake system?

Guy Wilber
Reno, Nevada 

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