I was recently watching some historical railroad videos and I noticed that in the discussion on RPO cars, staff working in the cars were all carrying firearms. I gather from the wild west times, that mail cars carried money since they were targets of train robberies. Does anyone know if the staff of a given railroad who worked on RPO cars were employees of the particular railroad or were they some sort of postal police employed by the US post office? Another railroad tidbit that caught my eye.
Ed