The scene shows an abandoned railway track converted into a pedestrian or cycle path, often referred to as a "Coulée verte" or "Petite Ceinture" in France. The architecture of the buildings in the background is characteristic of mid-20th-century French urban residential blocks. The lush vegetation and the specific style of the metal fencing suggest an urban park setting in Paris. I suspect this is part of the Petite Ceinture, the former railway circling Paris. I am fairly confident in this assessment.

then: guess