Should we have a means to alert the driver without the emergency button?

Sometimes one can hear a strange noise on the train which needs the driver's attention but does not form an emergeny. The other situation I had was a begger carrying a small child using the doors between cars while the tube was in motion in the tunnel. If the child had fallen it would have been killed. The begger should have been removed from the train by police at the next station. What do you do in that sort of situation?

Answers:
call police to be at the next stop

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