Terence is a crawler tractor, who works near Thomas' Branch Line. He is owned by Farmer Finney.
Terence had to help Thomas when he got stuck in the snow. He later helped Mrs. Kyndley, when her house was snowed up, and looked after her house when she went with the engines to a Christmas Party. In the second season, he befriended Duck while Thomas was at the works, and attended the Christmas Party at Tidmouth.
In the third series, he helped Trevor with the planting of new trees in the forest after a storm and assured Henry that the forest would look better than ever before. He also got trapped near a level crossing when Mavis got stuck and blocked the road. When Bertie got stuck in the mud at the Vicar of Wellsworths' party, Terence used strong ropes to pull him out. Later, when villagers were stranded by snow, Terence helped them by ploughing the snow away. In the fourth season, he was seen working at a farm near where Sir Handel had an accident.
In the fifth season, he warned James about the damage that trees can do, and reminded Percy that Mrs. Kyndley's daughter was to get married. He was also seen working at Boulder Quarry. In the sixth season, he helped clear away fallen rock on the line which had derailed Thomas, and almost Toby. He was later seen ploughing in a field, when Duncan lost his whistle trying to surprise him. In the seventh season, he helped clear away a tree that had fallen on the line, and pulled Elizabeth out of the snow.
When Thomas went missing, Terence helped with the search of him, and once Thomas was found, Terence informed Harvey of the news.
In the twenty-first season, Terence takes a shortcut over a frozen lake while collecting Christmas trees for the holiday market, but in the process the ice begins to break.
- Terence is also best friends with Skids & Mudflap and Sweetie Drops.
- Terence owns a blue lightsaber.