Flying Freighters are a mix between trains and bots. They are typically better than trains and bots in most situations, but shouldn't make trains or bots obsolete.
Mods introducing new content into the game.
Transportation of the player, be it vehicles or teleporters.
Augmented or new ways of transporting materials - belts, inserters, pipes!
Trains are great, but what if they could do even more?
Related to roboports and logistic robots.