Train World: the world is post-apocalyptic and the world is criss-crossed by trains over the desert and every so often an oasis springs up. Train pirates race to get to the oases. There are monsters across the wasteland like sandworms, giant spiders, mechanical dragonflies that steal parts of trains, and intelligent cactus people that can survive in the desert much more easily than humans and make guns that shoot their spines (infused with gunpowder, which deposits in large pockets underground and is often the subject of mining operations as it is important for making bullets.)

You have to kill the pirate prince who rides a giant train called Goliath which has a giant mouth to swallow other smaller trains.

You take an amnesia potion because you are guilty for killing the old pirate king and then realizing he was just a crazy old man. because you took the amnesia potion you don’t know why the pirate prince is trying to kill you.

Train World 2:

You are a train pirate. You think that the pirate prince died because the hero of the first game killed him. Trains use coal. You have to get coal. If you run out of coal, you have to get out of your train and steal it from people. So then, you realize the prince is not dead: he secretly survived. and so he has secretly been building Titan: he has to fuse Goliath and his very old legendary train: Colossus. You have to help him

Train World 3:

this is the prequel to Train World 1&2, it is set before the apocalypse. You work for the government and you deliver water to people, kill train pirates, and kill monsters. You eventually realize the government is evil and have to destroy it even though it will mean the end of society.