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Bertie is a red bus who works near Thomas' Branch Line.
Bertie is continuously alluding to his race with Thomas and how he could win next time. Bertie and Thomas have seemed to continue this tradition of racing. However, he was re-routed giving him an advantage. Thomas is still able to beat him occasionally.
Bertie is friendly and ready to help anyone in need, but can't resist teasing Thomas about being slow.