Passenger trains may employ one or more brakemen/assistant conductors who assist the conductor and engineer in the safe and prompt movement of the train, to share the workload, and accept delegated responsibility. If a train crew's route, or tour of duty, exceeds a single shift, or conflicts with a legal or contractual limit on the number of work hours, more than one crew may be assigned, each with its own brakeman/assistant conductor. Onboard service crew members on passenger trains normally remain on duty for the entire run, including assigned meal and sleep breaks.