Talk:Ruling gradient

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Tunnels

Ardglen
- 500 m (1,640 ft) estimate from Curve and Gradient book.
- 487 m (1,599 ft) ^[1] Bayley
- Bayley doesn't mention gradient

References

^ Tunnel on Australian Railways, by William A. Bailey, Austrail Publications, 1974, page 9

tunnel talk

The whole missive on tunnels should be in a separate article.

The case with the Cascade Tunnel is less than hypothetical and ignores geographical reality. I believe the primary reason the original tunnel was replaced, was the winter avalanche problem on the west approach.

Baden K. 189.188.230.218 (talk) 23:30, 28 November 2015 (UTC)[reply]

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[1] Tunnel on Australian Railways, by William A. Bailey, Austrail Publications, 1974, page 9

[1]