This RPO (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.