Outlaw (railroading jargon)

The term outlaw, or outlawed refers to a crew (or train) which can no longer move because the crew has reached the maximum number of hours they are allowed to work, thereby outlawing their controlling the further movement of any train. All they may do is be relieved or deadhead to a "home terminal" (such as the place where they came on duty near their point of residence) or an "away from home terminal" (such as an approved hotel) to begin a period of rest.

Source: Wikipedia — Outlaw (railroading jargon) (CC BY-SA 4.0)