Emily

Emily is an engine owned by The North Western Railway, who pulls passenger trains on the mainline

Bio
Emily was bought by the NWR sometime in the early 2000's, she and Thomas got into an argument the first day she arrived, after a coach mixup, but after she saved Oliver from an accident, he gained her trust, Emily was involved in several accidents and incidents throughout her time on the NWR, she solved a problem involving Gordon and the new engine Danny, who became good friends after the events, Emily was a victim of The Diesel Invasion, but like all the other steam engines was freed afterwords, and she voted for Emily Hatt during The Election Of The New Controller

Trivia
The Model MMM uses for Emily is the original version from 2004