The Submarine Engine (Sodor)

The Submarine Engine is an upcoming episode in the twenty-fourth series.
== Characters ==
* Edward
* Gordon
* Bill and Ben
* Harvey
* Porter
* Salty
* Hugo
* Sir Topham Hatt
* Franz
* Cranky (cameo)
* Carly (cameo)
* Big Mickey (cameo)
* Thomas (cameo; narration only)
== Trivia ==
* A reference to Gordon Takes a Tumble