Onotake Tunnel - 小野嶽トンネル

No. 3 Ōkawa Bridge 第二大川橋梁Onotake Tunnel 小野嶽トンネルOnogawa Bridge 小野川橋梁

Description - 解説

Opened in 1932 together with the Kamimiyori ~ Yunokami section of the Aizu Line; this is the only one of the original Aizu Line tunnels still in use in its entirety.

The tunnel is between No. 3 Ōkawa Bridge and the Onogawa Bridge just to the north of Yunokami Station. Given they originate from the same time, I think it's safe to assume that the construction method was the same as for the Onumazaki tunnels, with the original tunnel wall being made entirely of concrete bricks, with a lining of poured concrete up until about halfway up the side walls. Later, the poured concrete layer on the lower half of the walls was given an extra layer, and a layer of wooden boards was applied to the arch of the ceiling where the brick was exposed; this was fastened in place by iron ribs that ran all the way around the arch from floor to floor.



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