(Railway Post Office car) is painted in the dark blue and gray
B&O scheme with gold stripes and lettering. The roof on this
car is black. Although the car was built in 1913, this particular
scheme reflects the B&O RPOs of a later era , the 1950s-1960s.
This Class H-9 RPO, like other RPOs, was built to Post Office
specifications and changed several times over its life to represent
the traffic that was on the line on which it operated. Mail sorting
on trains, in dedicated post office cars, was an established procedure
by the time the transcontinental railroad was completed in 1869.