Made me think.
Just witnessed an incident of a 6.4ft tall and well built man drunk of his head causing a huge scene in the tram and then approached the driver and stood there shouting and slurring out whatever he was saying.
Do these drivers have a duress alarm then can just press without offenders noticing? I know for certain if that was me in the driver's situation, I'd be hesitant to call 000 in fear of situation escalating.
Ill also add i stopped of the next stop and rang 000 :)