Start on any of the first three planets: Vulcanus, Gleba, or Fulgora. Choose your planet in the startup mod settings before starting a new game. Compatible with many modded planets!
Mods introducing new content into the game.
Transportation of the player, be it vehicles or teleporters.
Map generation and terrain modification.
Elevated rails are must-have to have any meaningful amount of production so they definitely should be unlocked earlier