Groundman

As a matter of practice, most captains leave the rolling to the groundman, who may usually be trusted to know what is best, and act accordingly.

Source: wiktionary

He had extracted it from the groundman, who had extracted it from Sneard's gardener, who had extracted it from Sneard's housemaid, with whom he was on more than friendly terms—so of course it was authentic.

Source: wiktionary

The groundman and mechanic will find it of aid in passing the required examinations for the mechanics' license and ratings.

Source: wiktionary

Groundmen had to be employed to assist, and subsidiary signal boxes were required to watch over the condition of the platform roads and the yard lines, for there were no track circuits.

Source: wiktionary