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The Railwire is not your personal army.
They would not be lighter as loads due to the helium being pressurized...
Hmmm , I didn't think of that .
likely there is a sweetspot where the cars would be slightly lighter, but fully loaded these cars were quite heavy IIRC...It Would make an entertaining scene to have a Helium plant with floating railcars held down by chains T track module
i would assume the product is liquid hydrogen and if it is for SpaceX than it is probably liquid oxygen.