The Australian Engine and The American Diesels share the exact same horn sound as Mavis' current one from the fifteenth series onwards and its the same one used for Diesel, but in Misty Island Rescue to Series 14 and it was also used for him in some merchandise and some games (maybe).Awdry's model of Mavis was actually made in 1962. It was not until ten years later in 1972 that Mavis debuted in the Railway Series itself.Mavis was the last character Wilbert Awdry created before he retired from writing the Railway Series.Mavis' television series model is currently on display at the Hara Model Railway Museum in Japan and is wearing her concerned face mask.Mavis' cross face mask is now owned by Twitter user TomsProps.In
the Railway Series, Mavis' brake pipe is on the right side, but in the television series, her brake pipe is on the left side.At
The Train Shed, Mavis wore one of Toby's face masks.Mavis used to be one of the characters to appear in every series of the television series since her introduction until the twenty-second,twenty-third and twenty-fourth series, in which she did not appear in any episodeIn Series 6 only, she had Derek's horn sound.In
Series 7 only, she had Daisy's original horn sound from Series 2.In
Calling All Engines! to the sixteenth series episode "Thomas and the Sounds of Sodor", she had a new horn sound and it was also used for her in some games.In
Series 15 onward, she has Diesel's horn sound from Misty Island Rescue to Series 14.In
the game, Engines Working Together and on the Diesel's Locomotion Mayhem ride at Drayton Manor Theme Park, she incorrectly had Diesel's horn sound, however her horn sound from Calling All Engines! can be heard when Every Cloud has a Sliver Lining still plays there.Her horn sound from Calling All Engines! would later be reused for Norman in Day of the Diesels only. Mavis had a total of seven facial expressions during the model series era.