Dual-Chain drive train

https://www.bikeradar.com/news/buffalo-utility-s2
Made for developing countries to allow for easier transportation on cargo bikes, without the exposure and complexity of an external derailleur or hand-operated shifting (for an internally geared hub). It was developed and patented with the help of SRAM.
It appears to engage one drive train or the other through a back-pedaling action, forcing the pawls in the freewheel to toggle from one side to the other.
It's been tested for over two years in the field with great feedback (according to the article) and is now being marketed in 3rd world countries.
The design won the Eurobike Gold award in 2024 for "excellence in design and innovation within the cycling industry"
More information at https://worldbicyclerelief.org/s2/
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