LoL!
Pawel, it was probably inapt of me to apply a nationality, and not specify in an engineering history sense of such meaning.
After all, even now in the 21st century we have to remind the NCOs to teach the new recruits to not drink the gasoline if siphoning by mouth
I mean really. It was only today that I noticed that those are not German, but American jerry cans
I freely admit I had not considered captured/appropriated rail stock. The "standard" 1435mm rail gauge was anything but standard in the 40s; 1500, 1400, 1450 gauges were also in use (mostly to limit invading armies from using rail).
The mystery remains unresolved.
Hmm, so, was there a dedicated Opel, or the like, tanker truck?