a pair of Brünigbahn Deh 4/6 cog-wheel luggage van locos, Switzerland, 1970

Or, SBB Brünigbahn Zahnrad-Gepäcktriebwagen Deh 4/6 as they are called in German.  A total 16 of these were built over 1941-1942 for the metre-gauge Bunigbahn (see earlier posts).