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I came across this video[0] a little while ago which gives a pretty in depth look at the efforts being made to modernize bridge and tunnel infrastructure in a crucial but small subsection of the American rail network.

[0] https://www.youtube.com/watch?v=6yLzfNTrULg



I knew this would be the B1M just from your description. I’ve been a subscriber of theirs for quite some time now - they have some fascinating videos.




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