Stuingtion's engines tell the story of Megatrain

Here's how Optimus tells Thomas' about Megatrain in Thomas' Place as a Prime.

Optimus: Years ago a Decepticon arrived on earth. He took a disguise of a train, he killed many humans, by taking there souls. But then i banished him to the gas giant Jupiter.

Brian: How did he escape?

Optimus: He must have escape by using an Autobot ship.

Thomas: An Autobot ship?

Cadance: Well i know who can stop him?

Optimus: Now Cadance, there's only one who can stop Megatrain. Spencer.

Thomas: SPENCER?!

Gordon: You mean the Spencer?