https://nl.wikipedia.org/wiki/Bakkersstraat_(Amsterdam)

Machine translation, I don’t speak Dutch:

The bend of the tramway from the Bakkersstraat to the Amstel was too tight to be taken in a normal way. That is why the track first crossed the track on the Amstel and then to connect to that track via an extra arch. The arch was protected with chained posts. However, on 6 September 1950 it went wrong and a tram set of line 4 next from the Bakkersstraat could not brake in time, so the head of the motor car in the Amstel dived.