Hostler

A hostler or ostler is a groom or stableman, who is employed in a stable to take care of horses, usually at an inn. In the twentieth century the word came to be used in railroad industry for a type of train driver.
Etymology.
The word is spelled "hostler" in American English, but "ostler" in British English. It traces to c. 1386, meaning "one who tends to horses at an inn"—and also, occasionally, "innkeeper"—is derived from Anglo-French "hostiler" (modern French ), itself from Medieval Latin "the monk who entertains guests at a monastery", from "hospitale" "inn" (compare hospital, hospitaller, hospitality). A similar word, "hostelero" (innkeeper, the one that took care of a hostal), exists in Spanish.
Modern uses.
According to the "Dictionary of Occupational Titles", a hostler in motor transportation is a type of truck driver who directs trucks or tractors at vehicle parking or docking areas to move, position, or park trucks or trailers. In the United States railroad industry a hostler is a train driver, a type of railroad engineer who moves locomotives in and out of service facilities.