Sounds like Beast Philanthropy of bikes
Bicycles
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Ride bikes
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The fuck is that drivetrain?
It's by design: https://newatlas.com/bicycles/two-chain-buffalo-bike
The idea is that if you lose one chain, you can keep riding till you get somewhere that you can get it fixed. In places where infrastructure is iffy, this could be a life-or-death feature.
Looks like field repairs to me.
Rear derailleur no longer usable, so you shorten the chain for a specific gear. Add the second chain for reliability and decreased slipping.
World Bicycle Relief gave me the new bike to ride. The S2, it is called. The S2 because it’s a two-by, with two chains and an internally geared rear cog that shifts when you pedal backward.
(From the article)
In my defence, I hadn't yet read the article...
But it's so cool!