Original sentence: Mavis is a diesel; she is mostly black, with yellow-and-black "hazard" stripes on her front and rear.Mavis was the last of the Standard Gauge engines to make the transition from The Railway Series to the TV Series
Edited sentence: (responsible for the series) announced that they would introduce a number of female characters, including Mavis, to counter allegations of sexism.Despite looking somewhat like a steam engine, Mavis is in fact a diesel.Fans were quick to point out that firstly, the character had been in the Railway Series since 1972, and had been introduced to the television series in Season 3.Indeed, when Season 4 was in production, Britt Allcroft Ltd.Mavis was the last of the Standard Gauge engines to make the transition from The Railway Series to the TV Series (apart from Stepney, who is not a "Regular" character).She has been utilised since, but sadly it is often as a "token female" character.She is mostly black, with yellow-and-black "hazard" stripes on her front and rear