Sun West Line is an automobile-carrying train created by Apollo. He tells Percy Jackson, Grover Underwood, Thalia Grace, Bianca di Angelo, and Zoë Nightshade to use it to go west in The Titan's Curse.
After defeating the Nemean Lion and losing the Skeleton Warriors that were following them, by taking a train, Percy, Grover, Thalia, Bianca and Zoë reach the end of the line with nowhere else to go. They approach a homeless man who is warming his hands in a fire in a drum can. He suggests they get on a train that was moving along, which turns out to be the Sun West Line. After they get on the train, the homeless man disappears and the fire is put out. They board the train, where inside are expensive cars, which the group rest in. Later the homeless man named Fred appears again and talks to Percy whilst the others are sleeping, where it is revealed that he is actually Apollo.
- It was on this train that Percy has a dream, which explains the past of his sword Riptide.