Examples from the Web for yardmaster
Ralph ran up to the yardmaster and held out his watch to him.Ralph, the Train Dispatcher|Allen Chapman
Bad orders, the bane of a yardmaster's life, the teasers of the traffic man's tracers, block our terminals.
The yardmaster hesitated a moment and turned to an older man at his side wearing a heavy cap.The Mountain Divide|Frank H. Spearman
From one viewpoint these mechanical questions are too highly technical for the yardmaster.
The obvious inference was to relieve the yardmaster of responsibility for mechanical matters.