Facts and Figures
- Length of tunnel I: 19,803 m (12.305 mi)
- Length of tunnel II: 19,823 m (12.317 mi)
- Elevation at north portal, Brig: 685.80 m (2,250.0 ft)
- Elevation at crest of the tunnel: 704.98 m (2,312.9 ft)
- Elevation at south portal, Iselle: 633.48 m (2,078.3 ft)
- Gradient on north side: 0.2%
- Gradient on south side: 0.7% ( 1 in 143)
- Start of construction on north side: 22 November 1898
- Start of construction of south side: 21 December 1898
- Breakthrough: 24 February 1905
- Inauguration: 19 May 1906
- First electrical operation: 1 June 1906
Read more about this topic: Simplon Tunnel
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