Passing gas ...by rail .
War was meant to be fought in the air ...but you needed a whole bunch of stuff going on at earth level to get off the ground .
US Navy airships began in WW1...kicked into high gear for WW2. Helium was much more stable than Hydrogen.
Special cars were designed to transport helium ...1930-1960's .
Hawk ( wood model airplane maker out of Chicago ) offered an O scale helium car kit 1938-41 .
Postwar Ambroid offered a kit in HO .
To read a whole bunch more about "Passing Gas " please see link for interesting article .
https://www.amarillorailmuseum.com/helium-car-history
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