Bear (originally known by his number, Diesel 7101) is a mixed traffic diesel engine who works on the Main Line. His name comes from the growling noises his engine makes, which make him sound like a bear.
The Railway Series
Bear was originally known as D7101, and came to Sodor on loan with another diesel named D199. His companion was blatantly arrogant, and bad-mouthed the steam engines. Vulgar noises greeted this, until Duck and D7101 managed to shut up D199.
The next day, 7101's injector failed while pulling "the Limited". Henry, who was already towing 199 and his train of oil tankers, came to help; 7101 was still able to move by himself with some help from Henry. To the passengers' delight, Flying Scotsman took their train, while Henry helped 7101 home. Along the way, Henry told the diesel about his failed regulator. 7101's opinion of steam engines was greatly changed after the incident.
The engines persuaded the Fat Controller to let 7101 stay on the North Western Railway, and renamed him "Bear." Bear liked this name, saying it meant he "really belonged." Even James, who was the last to accept diesels, could not help but like him. It later was revealed Bear pulls the Express when Gordon, Henry and James are busy. Bear also did Henry's duties while Henry was at the Works.
Thomas and Friends Made Up Story Series Style
In 2018, Bear broke down at Tidmouth on the middle line. And because the other through lines were occupied by Duck and Oliver, Gordon, who was heading to Knapford, was sent into a siding, and crashed into the stationmaster's office. It was later revealed that someone had put a fire cracker inside Bear's engine, which caused him to break down.
Bear is one of the more polite, charming, respectful, useful diesels. He is a loyal, friendly, and sympathetic sort, but he is extremely noisy and obstreperous, as he often makes unusual growling noises much to the disturbance of the other engines; thus earning the name "Bear." The Fat Controller was impressed with BoCo and Bear; he called them "versatile" because they could pull both coaches and trucks. BoCo and Bear usually defend the steam engines when a visiting diesel boasts about how superior they are.