逢坂山トンネル, Eisenbahntunnel in Japan
The Ousaka Mountain Tunnel is a railway tunnel located near the border of Kyoto and Shiga Prefectures, passing through solid mountain rock. The passage spans about 665 meters and features carefully fitted stones and bricks in a horseshoe shape, a design common for train tunnels of that era.
Built in the late 1880s entirely by Japanese workers without foreign engineers, the tunnel was Japan's first mountain railway tunnel. It served the old Tokaido line until the early 1900s, when newer tunnels were constructed to handle faster and heavier trains.
The tunnel is connected to local history and engineering pride, with a stone plaque marking its creation and showing the skills of Japanese builders. The name on the sign honors a notable official from that era, reflecting how the place preserves respect for this past.
The site is easily reached on foot from the train station, and informational signs explain its history along the way. Visitors can view the tunnel from outside since the entrance is closed for safety, but should respect all markers and avoid attempting to enter.
A building nearby was constructed directly on top of an old railway bridge, and visitors often wonder if its occupants realize they stand on a former train route. During wartime, parts of the tunnel complex were adapted as a factory for aircraft components and later for scientific research.
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