Proteus is a small bright yellow tank engine. He wears a magic lamp hanging upon his funnel. In the story "The Magic Lamp" (on the Tales from the Tracks DVD), Skarloey tells the story that if someone finds the lamp, their wishes are granted.
Proteus is part of the magical world of Thomas & Friends. The engines all work and play together on the Island of Sodor. While they are doing their very useful work, they learn important lessons about friendship and getting along. Many of the characters are available to purchase as part of different toy brands, including the timeless Thomas & Friends Wooden Railway Series. You can purchase Thomas and many of his engine friends, as well as wooden track, buildings, destinations and sets from the simple oval to the Deluxe Tidmouth Sheds set. Many engines are available on a limited basis and are retired, so check ebay or other online auction sites for your favorites if you can't find them here or in a store near you.