[yahrd-mas-ter, -mah-ster]
a person who superintends all or part of a railroad yard.

1870–75; yard2 + master

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
In addition, clerks and trainmen ebb and flow to yardmaster positions.
The yardmaster knows in advance what kinds of work they will be doing a day in advance, and adjusts the schedule accordingly.
Under this scenario, the yardmaster would be performing covered service under the hours of service laws.
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