1 Scanning for any unforeseen event.
Along the route: Tree branch fell on the rail, people/animal/vehicle incursions, sabotage.
On the platform: check no one is being silly while the train approach. Brake to prevent people to die.
2 On emergency: marshaling the evacuation.
3 All the time: provide a point of contact for the train, for whatever authority or entity needs to contact the train, and vice versa. Reset or fix any basic mechanical issue, including for example, a passenger operating the emergency brake for no reason.
4 Most importantly: take decisions. Decision making is very very important.
All of the above can be automated, but for now the cost and reliability is not within range of having a real person there with appropriate training.
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