Definitions:

1. A railroad employer who is in charge of a railway yard. NOUN
   • The yardmaster's unwavering vigilance ensured the smooth operation of the vast rail yard.
2. A railroad official who oversees and coordinates activities in a railway yard. NOUN
   • The yardmaster's knowledge of the sprawling rail network allowed him to optimize train movements and minimize delays.
3. A supervisory role within a rail yard, responsibel for overseeing the movement, organization, and dispatch of trains or rail cars within the yard. NOUN
   • The yardmaster coordinated with the crew to organize the rail cars for the next departure.

Synonyms:

• dispatcher
• stationmaster
• train dispatcher
• trainmaster