Mighty Joe is a locomotive 1225 tender engine. He's biggest and he wisest engine of all of Hiatt Grey's engines. He normally gets tricked by Puffer, and Mighty Joe normally watches Puffer so he can keep out of trouble. He huals the heaviest loads there is like pulling coaches and pulling frieght cars. And is always ready to fight, armed with a massive M61 Vulcan Mini-gun: He will take down the biggest army. He is one of the only engines with a Vulcan.
Mighty Joe is a mighty engine that pulls the express and good trains. Along with his sister Daylight they get the job done with ease. He is a wise engine who knows coaches better than Gordon. And pulls freight cars better than Henry.