- Q-inspection (US): Also quarterly or periodic inspection, a federally-mandated safety inspection performed on a locomotive every 92 operating days.
- Quiet Zone (US): A designation by the Federal Railroad Administration that removes the requirement for train operators to sound their horn when approaching each public crossing in a certain area, oftentimes near residential neighborhoods who have asked for the status. Because the train does not sound its horn while approaching the crossings, safety upgrades to all of the crossings must be made in order to compensate. These upgrades usually include double gates, additional signage, lights, and bells, if they are not already present.
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