A new theme song and incidental music were composed by Ed Welch and Robert Hartshorne, respectively. Episode runtime was increased to seven minutes. The series was produced using digital video camera, creating a somewhat different look for the show. Other changes included the additions of CGI educational sequences and transitions between stories. Executive producer Peter Urie also left, while Jocelyn Stevenson remained in her role as executive producer. Sam Barlow became the story executive, while Abi Grant and Paul Larson served as script editors. This series saw the adoption of a centralised cast, including Thomas, Edward, Henry, Gordon, James, Percy, Toby and Emily.