Great battery life and linux unfortunately are a hard task and linux support is often spotty for consumer devices.

Sticking to used business hardware is usually a good start, but you should check for compability issues nonetheless.

Used t490 / t480. Can you elaborate on the “heavy limited by space”?

If someone was willing to invest into building and maintaining infrastructure there would be no need for this concept, but that’s a political issue. The idea of this concept is do make the best of what you have.

How would traffic pass each other? You would be stuck with the same issue as normal trains.

Naive question: Does analogue photography still have advantages regarding image quality, that can’t be replicated with digital sensors, or is it more about the psychology of making every photo a deliberate investment?

Yes, as the semantic of words is context dependent.

Hmm the prices on eBay really don’t seem that good to me in comparison to newer generations. I guess the power consumption will eat up any savings pretty quickly. Though this might differ for whole sets.