Hostler

A hostler (/ˈhɒslər/ or /ˈɒslər/) or ostler /ˈɒslər/ was traditionally a groom or stableman who was employed in a stable to take care of horses, usually at an inn, in the era of transportation by horse or horse-drawn carriage.

[1] In the twentieth century the word came to be used in the railroad industry for a type of train driver in rail yards with switcher locomotives[1] or a type of truck driver in similar work with terminal tractors.

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 hostelier), itself from Medieval Latin hostilarius "the monk who entertains guests at a monastery", from hospitale "inn" (compare hospital, hospitaller, hospitality).

[2] A similar word, hostelero (innkeeper, the one that took care of a hostal), exists in Spanish.

[3] 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.