Emma is an antique, anthropomorphic steam engine, being an 0-4-0 tank engine, who carries Luke, the engineer; and Jim Button, a small black boy, on a fairy-tale search and rescue mission for a Chinese princess.
- Train Bult: Steam Engine
- Appearance: Jim Button (1996)
- Gender: Female
- Agliment: Good
- Allies: Casey Jr. (brother), Toots (best friend), Tillie (girlfriend), Tootle, Montana (father), Pufle, Ivor, Jebediah, Georgia, Pete, Farnsworth, Alfred, Melissa, Tom Jerry, Blue, Greendale Rocket, Johnny (good friend), Doc, Huey, Silver Fish, Rasmus, Jason, Sir Reginald, Katy Caboose, Alan (steam engine), Piper, Tracy, Rusty, Humphrey, Rodrick, Minerva, Shelbert, Mary, Streamer, Calley, Bonnie, Sasha, Wartime, Sir Norramby
- Enemies: Cerberus
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