Journey to the Center of Sylva

Sylva is an exoplanet much like Earth. It has diverse biomes such as forests, canyons, and mountains and well as average wind and sunlight. Like with every other planet in the solar system, you must reach the center to activate its core in order to unlock fast tavel. With my sprawling base above ground, with all you can ever need on an alien planet, it seemed all that was left to do was go down. The subterranea is treacherous! One bad step and you can find yourself trapped in a crevice witout oxygen or at the bottom of a ravine. One railroad later (plus a portable oxygenator), and now we have a direct line to the center of planet Sylva. Building it was no easy feat. It took lots, and I mean lots, of aluminum and compounds.
Now, with the underground monorail, life is a lot easier. Travel to and from the core only takes a jiffy so ferrying resources from there , like Astronium, is very convenient. There's much to be found in the mantle and core, but for that you would need to optimize the train, send an exedition, disembark, and stray a bit from the railroad. Be sure to refer to your compass if you wander too far. You can find old tech both working and defunct, raw materials, and even some anomalies depending on the planet.