Stephen is a locomotive based on the famous steam engine, Stephenson's Rocket.
- "Stephen Comes to Sodor"/"Fix-Me-Up" Stephen (2013)
- "Dusty" Stephen (2013)
- Stephen with Open Coach (2013)
- His tender is a part of his body.
- Stephen's rusty model has a tilted funnel, the first model to bear this feature.
- Stephen's regular model has six wheels but his rusty model only has four.
- His model only has six wheels. In the show, Stephen has four wheels on both his tender and himself.
- The original prototype featured a closed cab and had no front magnet.
- Stephen is the second engine to feature an open cab, the first being Neil.