Tanna Tunnel
| Overview | |
|---|---|
| Line | Tōkaidō Main Line |
| Location | Shizuoka Prefecture, Japan |
| Coordinates | 35°06′16″N 139°01′00″E / 35.10444°N 139.01667°ECoordinates: 35°06′16″N 139°01′00″E / 35.10444°N 139.01667°E |
| Operation | |
| Opened | 1934 |
| Operator | JR Central |
| Character | passenger/freight |
| Technical | |
| Line length | 7,804 meters |
Tanna Tunnel (丹那トンネル Tanna-tonneru?) is a railroad tunnel in Shizuoka Prefecture, Japan operated by JR Central’s Tōkaidō Main Line. This 7.8 km long tunnel shortened the trunk route between Tokyo and Kobe by omitting a detour round the mountains between Atami and Numazu.
The initial routing of the Tōkaidō Main Line railway connecting Tokyo with Osaka avoided the Hakone mountains between Shizuoka and Kanagawa Prefectures by a long loop north to Gotemba, and then south to Numazu. This is the line now called the Gotemba Line and the same routing followed by the Tōmei Expressway vehicular highway to this day.
Recognizing that this loop north through Gotemba was a major bottleneck in the rail system, the Japanese Railroad Ministry issued a contact in 1918 to the Kajima Corporation to build a tunnel. The project was heralded as a major public works endeavor that would boost the Japanese economy out of its post-World War I economic recession.
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