It's possible you're thinking of:
* Thomas the Tank Engine: A popular children's franchise featuring a blue tank engine named Thomas. It's possible you've misremembered the name or the character.
* A lesser-known children's book or character: There might be a lesser-known story or character with the name "Tootle," but without more information, it's impossible to pinpoint.
Could you please provide more context about what you're looking for?
For example:
* Where did you hear about "Tootle the Engine"?
* What kind of story do you think it is?
* Can you remember any details about the character or story?
The more information you can provide, the better I can help!