Thurston Troodon is 29 years old, and he's the Conductor of Engine #12, the replacement Dinosaur Train, He's a bit more friendly, he's actually fair, and a lot more nice, He was Sonny's classmate in Conductor School, both were the top of their class, which resulted in a rivalry, but they're relationship grew into a strong friendship that even evolved to a romantic relationship after their days in the school.
Thurston remembers vaguely about that day, and he's become Sonny's rock over the years.
He has a close relationship to the Troodon-Conductor Family, His idle was actually Tabitha, who was well known for being a kind, warm and polite yet strict Conductor, and having a welcoming atmosphere about her. He's also one of the Troodons that made Sarah realize that keeping Gilbert away from Sonny for a petty reason (claiming Sonny is insane and implying that it was contagious) was unhealthy and would result in negative traits in the future.
He's also close to the Pteranodon Family, especially with Shiny, Don and Mr. Pteranodon.

He wants to help Sonny in his search for the truth, besides someone has to make sure Sonny doesn't do anything too reckless.