Ōto Tunnel - 大戸トンネル

No. 2 Ōkawa Bridge 第二大川橋梁Ōto Tunnel 大戸トンネルNo. 3 Ōkawa Bridge 第二大川橋梁

Description - 解説

Opened in 1932 together with the Kamimiyori ~ Yunokami section of the Aizu Line. I'm not sure if the original tunnel was called Ōto Tunnel or something else; the current tunnel - which shares the original down-side portal of the old tunnel - is called Ōto Tunnel, so the name is convenient until I learn otherwise.

The tunnel was between No. 2 and No. 3 Ōkawa Bridges, and was about 300 m long. 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.



Back to Aizu Line index - 会津線のインデクスへ帰る
Contact - 通信