During World War II, the entire city was darkened: this applied to the trams and to the whole city. The result was many accidents, which were all indexed and photographed until 1942.
This is the result of the accident 6373 of 13/04/1942. This is also the last photo of this collection. There were probably no more films available at that time.
The darkening glass, with route number (56) around the front light is clearly visible.
The photo was made by the T.B. (tram company), a print is in my personal collection.