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As the article points out these things are lovely until you have a hill. Fortunately the original designer built it for use in the Netherlands, a country purpose built for human powered vehicles due to its flatness. I do question its utility in any environment even remotely less flat than NL. I guess you could take it to Denmark too?

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It has always amazed me how even an almost imperceptible upslope can increase effort moving up it.

I guess the answer here is something like a ski lift powered by the handcarts going downhill.

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I would pay to see that contraption. I'd pay double to ride the ski lift