Exploring various portals into technology and mythology, science and fiction...
https://en.wikipedia.org/wiki/Ship_Canal_Bridge
An impressive 12 lane bridge, but there was never a rail component in the design.
https://www.seattletimes.com/opinion/editorials/prioritize-fixing-i-5s-ailing-ship-canal-bridge/
https://historylink.org/File/3312