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"HE 125" belongs to the transit authority.
It's colloquial name is "pioneer vehicle", because it is specially built for protecting the right of way. In practise this means using it's winching an jacking equipment (also good for rerailing trams) to remove misparked cars or as now -safety earthing.
The people who drive it are called "trick men" because the multitude of jobs they have to do on top of being mechanics.