Because Trainz: A New Era needs to have more models of Frosty's Winter Wonderland Train, The Brave Engineer Old 4-8-0 Mastodon Twin Engines No. 77 and 75/5, their freight cars and caboose, Linus' coaches, caboose, Samson, his coaches, Ivor, his freight cars and coaches, Tillie and Georgia's Birthday Train cars, Jebediah's milk wagons, Pete's freight cars, Farnsworth's coaches, the Play Safe engines and rolling stock, Porky's Railroad engines and rolling stock update and made by Tangy to create. That's why the names of the engines as Zeb, Zeek, Dakota, Montana, Baltimore, Alfred, Toots, and Silver Fish, who are Casey Jr the Circus Train's friends.