So what will the authorities in the Netherlands do in this situation? Put a ticket on it and then wait for the owner to move it? Tow it to an impound lot? Flip it and light it on fire?
Whatever size the vehicle, you can't block the tracks...
EDIT: I've been in this situation in streetcars in San Francisco and New Orleans. No emergency vehicles came, no super tow truck...the streetcar just waited and blocked traffic until the driver came back and moved their vehicle. I don't know what would have happened if the driver never came back, but nothing happened in the 20-30 minutes we waited.
In my country they tow tram track blockers immediately. I think it's some sort of 'emergency' towing too (arrives faster and is more expensive). If it takes too long, they temporarily replace the tram line with a bus. I imagine it's the same in many places.
In Helsinki they have a specific emergency vehicle for clearing tram tracks. It's especially busy during winter as snow takes away some space from the parking and cars tend to start taking space away from the trams.
Article is in Finnish but hopefully automatic translation can get enough across.