An article in FDTimes gives the background to dolly track and the materials used.
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Article on dolly track
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Posted 19 June 2015 - 10:52 AM
I'm afraid when I built track it didn't occur to me to use anything but aluminium, simply because the steel would rust. Stainless would suffer similar catastrophic failure (snapping) as aluminium.
And I suspect I'm not doing anything even nearly large enough to need the strength.