Tillie Olivia is The Great Domain, and she's been a character I've been wanting to give an anthropomorphic form since I made the association of her being an "iron horse"

Fanart is permitted of her, but please ask if you wanna do some kink art with her

EDIT:
Here's some fun statistics about Tillie in this form:
Age: 812
Height: 65 ft or 19.8 meters
Weight: 150 tons (including her "Tender" weight, which is 65 tons)
Top speed: Light speed