Image: CPRR Summit Tunnel Central Shaft
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Description: The vertical central shaft of the CPRR "Summit Tunnel" (Tunnel #6) at Donner Summit which allowed drilling and excavation of the tunnel to be carried out on four faces at once during construction of the 1,659 foot tunnel over a period of 15 months in 1866-67. Original digital photograph taken by the uploader (Centpacrr) inside the Summit Tunnel in August, 2003.
Title: CPRR Summit Tunnel Central Shaft
Credit: Transferred from en.wikipedia to Commons.
Author: Centpacrr at English Wikipedia
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: https://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes
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