I rather like this idea: an expedition or colony on another world has to, for some reason, pull up stakes and move. They can’t build large-scale high-tech machines from scratch, so they go all steam punk. They make simple wheels for all the hab modules, and on the building housing the nuclear reactor they fashon a pair of simple steam pistons to turn wheels, with no gear box or transmission. They have a 19th century train powered by a nuclear reactor, and likewise all the solutions they come up with have a steam-punk flair, combining modern engineering knowledge with more primitive materials handling and fabrication techniques.
So, that begs the question of: why would they have to move?
My original note suggested Mars, as it would be easy to come up with new iron parts. But what could possibly necessitate a move on Mars? So I open it up to any solar system “world” that can support humans living in sealed boxes. Some moons are problematic due to the radiation belts around their primary. Besides survivability with this level of life support, they need local resources for making new large machine parts (given they have power to smelt ores, liberate alumium, or whatever), and the environment must supply a reason why they must relocate.
Edit: The reason should be “realistic” science-based, so ghosts are not an acceptable reason. The situation should consider real knowledge about the geology and other properties of the settled body. Use real resources, not McGuffinite.