Here's my OC backstory and personality list:
Penny: A kind engine who voiced and became the Polar Express. She's a kind engine who does all her work without fuss.
Dick: A big pompous express diesel who thinks himself as modern and up-to-date that once worked on the Sante Fe Railway, until he came to Paradise Island. He loves any passenger train, but loathes any goods train.
Den: A friendly orange freight diesel. He was the friendliest diesel engine in America, and helped any engine he could in any way. He can have an attitude if someone bullies his friends, but he can be friendly.
Edman: A little Diesel Shunter that works hard, but loves to be cheeky at times. He was once the only shunter in his yard, and when others came, he started to get annoyed with how they did things. Soon, he had to learn how to work with others, and lets others to their own way, and him his own way.