Please see the top comment for how lifeguard systems avoid these issues - 30-minute short shifts, overlapping responsibilities, and monitored attention.
Train conductors do not require second-level reaction time. A train cannot stop in five seconds, no matter how quick the conductor is. People who are stopped on train tracks get killed, and the train operator is very rarely to blame.
Train conductors do not require second-level reaction time. A train cannot stop in five seconds, no matter how quick the conductor is. People who are stopped on train tracks get killed, and the train operator is very rarely to blame.