Daisy is diesel railcar. She is 'highly sprung and right up to date'.
After Thomas was sent to the works after crashing into the stationmasters house, Daisy was loaned from British Railways. She was awfully rude to Henrietta, Annie and Clarabel. Also she refused to sleep at Ffarquhar Shed as it was 'dreadfully smelly'. She is now more wise and has learnt a lot from Toby.
Daisy can be quite sassy and spiteful, but that's only when you get on the wrong side of her, she is often quite helpful and willing to help a friend in need.