He believed that the yardmaster could fix the Yorktown in 72 hours, and he was right.
From the forbes.com
Pearl's yardmaster told Nimitz it would take months to refit the carrier.
From the forbes.com
The liberal Democrat's dedication to them was born of his 40 years as a dispatcher and yardmaster with Southern Pacific and fueled by a passion for making opportunities available to everyone.
From the sfgate.com
More examples
A railroad employer who is in charge of a railway yard
(Yardmasters) supervise yard operations and yard employees. These position are often filled by promoting from within though occasionally an experienced supervisor from another industry is needed and accepted.