Little Engine is a little blue steam shunter who dreams of being a Dream Hauler. She becomes best friends with Richard. At first, she is unsure about taking the birthday train over the mountain, but with encouragement from Richard and the toys, and remembering Rusty's advice, Little Engine manages to bring the train over the mountain to the real world all by herself. Her wheel arrangement is 4-2-0 and her eyes are on the sides of her cab and mouth on her smokebox.
- Little Engine (as Tracy) met Thomas, Twilight, their friends, Amos Slade, Chief, Copper and Pelle the Police Car in Thomas and Twilight Sparkle's Adventures of The Little Engine that Could.
- Little Engine will meet Winnie the Pooh and his friends in Pooh's Adventures of The Little Engine That Could (2011).
- Little Engine will meet Captain Jake and His Pirate Crew In Captain Jake and the Never Land Pirates Adventures of The Little Engine That Could (2011).
- In many adventure series Little Engine's real name is Tracy.