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Did you know that many engineers are going back to wooden bridges because they last so long?
Wooden bridge resurgence? Emmet County builds one : News : UpNorthLive.com
Timber Bridge Construction ? Quality Timber Bridges Constructed by Bridge Builders
I wasn't so much thinking about the construction materials, as much as we have some obsolete infrastructure, and a lot of it is beyond traffic capacity. Wooden trestles are just fine running through the mountains. But a lot of railroad bridges, in urban areas do not have enough trackway, or too many trains are running on them. there's one example on the Potomac River, of a brick railroad bridge that is obsolete simply because it was built before modern ships and boats and it's a swing open bridge, and it has to swing open to let a lot of ships through which delays trains. That type a thing as more of what I was thinking about