(swiped from reddit's /r/thelongdark for now)
The Long Dark is a first-person survival video game developed and published by Hinterland Studio. The player assumes the role of a plane crash survivor who must survive the frigid Canadian wilderness after a global disaster disables all electronics. Welcome to our community!
Banner alt-text: Stone Church in Desolation Point, during an aurora. The moon hovers large, low in the sky. A fire crackles under the ruined wall of the church. The displayed health bar is distressingly low.
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By Krueger - https://www.indiedb.com/games/the-long-dark/images/island-map-great-bear-fan-made
It really lays bare some missing pieces. Like there's no road that goes to Mountain Town currently that connects into the wider network. And the future rail link after it terminates in Coastal Highway certainly has to go north to either Port Mary or Perseverance Mills.
Mountain Town is located "about halfway between Port Mary and the interior mountains", so it also may connect there, even if it's blocked off with the cave-in. So it makes sense for MT to connect via Blackrock to Port Mary. It's hard to see how that'll work - maybe MT to Pleasant Valley or Keeper's Pass. Then that would plausibly connect it to BR and PM.
Edit: Keeper's Pass South has a collapsed tunnel that definitely leads to MT, so that answers that. So the Port Mary connection probably happens via Pleasant Valley, past Thompson's Crossing through the blocked-off curve there.
Someone did a bit of a dive on it - https://www.youtube.com/watch?v=EgW-32vI1IQ