Shotgun Messenger
In the late 19th and early 20th centuries, a shotgun messenger was a private "express messenger" and guard, especially on a stagecoach but also on a train, in charge of overseeing and guarding a valuable private shipment, such as particularly the contents of a strongbox (on a stagecoach) or safe (on a train). The express messenger for stagecoaches typically rode in a seat on top of the coach, on the left next to the driver (who typically sat on the right side, operating the wheel brake with right arm).
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