Barotrauma devs FakeFish recently revealed Frostrail during the Triple-I Initiative event, and they're giving a "tentative yes" for Linux support. Swapping out a submarine and cold ocean for a train and frozen wasteland, Frostrail is a ruthless open world survival FPS where you have to carefully manage your train to keep pushing forward.
Speaking in a Steam announcement the developer said this about Linux support:
Will Frostrail be MacOs/Linux compatible?
One of our developers is primarily working on Linux, and we are eager to open Frostrail to the Linux gaming community. So that’s a tentative yes at this point at least for Linux. Our number one priority is making the PC version smooth and stable for Early Access release, and Linux/Mac support is also kept in mind every step of the way. However, we can only fully confirm support for these OS upon release.

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The publisher, Shiro Games, recently revealed that it amassed over 100,000 wishlists on Steam only 4 days after the reveal. Clearly there's a lot of interest in this one!
It will enter Early Access in 2026.
Added to wishlist!
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