Thomas the Tank Engine's Earth was a version of Earth located in a universe parallel to that of Earth-1A.
It was a very unique version of the planet Earth, because on this Earth, locomotives and other railway vehicles were sentient.
Many of them were on the island known as Sodor, which was located in the Irish Sea.
Thomas the Tank Engine and Devious Diesel both were locomotives that lived on this Earth. They often fantasized about being members of the Super Friends. Thomas imagined he was Superman, while Diesel imagined himself as Batman.
DC Super Friends™ MINIS Mash Ups Origin Story! I DC Super Friends Thomas & Friends
San Diego Comic Con Ft. Thomas as Superman & Diesel as Batman DC Super Friends™ Thomas & Friends
- ↑ As seen in this video.