I agree with you on the train drivers' announcements, they tend to suck most of the time and usually suck most when the train is moving, because the mike picks up all the noise from the engine. Or because the connectors between carriages / the cabling wears down and signal quality degrades.

But on a station it is possible to only put people in front of the mike who speak accent-free German and English, and to properly adjust and maintain the amps, speakers and wiring.