Emily

Emily is the #12 engine (but is actually not numbered) on the North Western Railway. She can pull light freights, but is far better suited for passenge services. She is also quite a friendly engine, and easy to get along with (though Thomas may disagree).

Thomas & Friends
When Emily was new to Sodor, she was ignored by the other engines for borrowing and pulling Annie and Clarabel without Thomas' permission or knowledge. The matter was resolved after she saved both Thomas and Oliver from a nasty accident on the cross-points and she was rewarded with two new coaches. Emily proved to be kind-hearted, as she was the only engine concerned about Henry when he was ill due to leaky tubes and when she stuck up for Salty when Thomas and Percy were teasing him.

However, Emily has proven to be a nuisance on occasion as she bossed everyone about when they were clearing up after a storm; Thomas when taking passengers and Percy when shunting trucks. When pulling the express for the first time, she was determined to keep to Gordon's timing, only to run out of water.

Later on she was assigned to the Flour Mill, while James was assigned to the Misty Valley Branch Line, primarily the Black Loch. James told her that there was a monster in the Loch. She had trouble with the Flour Mill and ended up crashing some trucks off the line. She was later reassigned to the Misty Valley Branch Line replacing James. She discovered that the monster was just a family of seals. She is presumed to still work the line as it has never been stated otherwise.

When Thomas had to stay at Knapford Sheds, Emily did not like his company at first as she didn't want any noise; she just wanted some sleep. However, she learned how comfortable it is to have the company of friends and once Tidmouth Sheds was rebuilt, she was transferred there to be with her new shed mates.

Like most engines, Emily can get quite puffed up in the smokebox. When she was called "Excellent Emily", she ignored the advice of Murdoch, Thomas and Duck only to get herself into trouble. Afterwards, she took their advice to get her job done.

Season 22: Reimagined
Emily is a very hard worker, and one of the few engines who befriends Rebecca on her first day on the Island. She defended her new friend's honor after Gordon and James chewed the latter out for sleeping in Edward's berth.

Behind the scenes
At this point in time, we do not have a VA for Emily.