Oliver is a wise excavator. He is capable of switching between different tools, including a bucket, a chisel for digging, a scissor claw, and a wrecking ball for demolition.
Oliver was first seen clearing room for railway lines at a quarry. The foreman called him to move some rock, but Jack wanted to move it himself, causing him to topple over on a hill. Jack learned from this, and allowed Oliver to do his jobs. A while later, he was digging foundations when he discovered some dinosaur bones, and appeared on the front page of Sodor Times. When clearing the way for the Harwick Line Marion the steam shovel met him and was convinced he was Oliver The Western Engine when she asked his name. She believed it was the work of Mike, Rex, and Bert of the Arlesdale Railway.
Oliver is wise and kind and keeps an eye on the other members of the Pack. He is good-mannered and hard-working and never complains about his work or gets impatient. He has the power and precision capability of moving and digging tons of earth in a single day. Oliver is kind and wise and watches over all the machines who work for the pack; because of this he can always be relied upon by Miss Jenny as a team leader
Oliver is painted brown with a pale green panel on his back and his number painted on him in red. Oliver has the cap rim of a builder's hat between his forehead and cab windows.
- Season 2 - Max, Monty and the Bull, Stanley and the Flood, and A Happy Day for Alfie
- Season 3 - Jack and Alfie Swap
- Season 4 - The Missing Tool and George Strikes Again
- Season 5 - Nigel, Bumble Bucket and Stanley's Branch Line (mentioned)
The Many Adventures on the Island of Sodor
The Adventures on Sodor