You'll never guess! If you do know, post it in the comments section with the spoiler function. Answer provided tomorrow!
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spoiler
I felt compelled to reverse image search. https://evelazarus.com/the-dunsmuir-tunnel/
I have no idea what tunnel it is. But I bet it has cars in it now!
I'm going to make a
guess.spoiler
They tore out the tracks and now it's a single lane car tunnel.
answer