"A train collided with a truck at about 7:45 (local time, 5:45 GMT) at the grade crossing near Sipplingen on the Lake Constance Belt Railway. According to the existing data, 12 people were lightly injured in the collision," the police of the city of Konstanz said on Twitter.
The railway stretch has been closed, the police added.
Firefighters are working to evacuate passengers from the train to the nearest train station.
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