Swiss Federal Railways is battling a basic problem with a new set of trains – toilet smells.
And politicians are now getting involved.
Long gone are the days when train toilets opened up directly onto the track. New systems carry their own treatment plant and on-board bio-reactors.
But it seems the bacteria that should break down the waste is being overworked on busy trains – leaving an unpleasant smell.
To fix the problem, the bacteria needs to be re-activated with an additive – and then given time to work. That means taking the train out of service.
Green national MP, Marionna Schlatter says it's important public transport is attractive.
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