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The Abt rail system, developed in Switzerland in the 1880s, is a narrow gauge track that specializes in climbing inclines by using a 3rd track that is toothed.
The Oigawa Railway's Ikawa Line is the only Abt system in Japan.
@zabadoh
This one is interesting. The Abt system is only between two stations on a steep grade and a separate locomotive shunts with the train, not shown here.
The picture is of the beautiful and unique station that is located on top of the bridge.
I've ridden this one, and I would recommend earplugs if you have sensitive ears.