Make mini trains mandatory usable before regular trains.
Small changes concerning balance, gameplay, or graphics.
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?
Hot, warmer and warm stone bricks cool down to their colder version, up to regular stone bricks.
Furnaces, assembling machines, production chains.