Льеж,

Двухосный моторный Familleureux

№ 133

Схепдал,

Двухосный моторный Baume & Marpent

№ 193

The exact location of the photo is most likely the Bressoux railway yard, near Liège. 100% certainty cannot be guaranteed.
The 133 was kept in a railway depot for many years (presumably near Liège, such as Kinkempois or Bressoux itself).
I'm not able to find out the exact story behind this photo (why they are standing on railway wagons).

Photo: Herbert Heller (Belgium).
Negative and photo from my collection and written permission to use the collection in my possession.
Sharing this photo outside Transphoto is not permitted.