The Duke and Duchess once bought a holiday home on Sodor and had Edward take their furniture to the house. The engines later helped to build them another summer house. They are good friends with Sir Topham and Lady Hatt and were among the important visitors who attended Dowager Hatt's Sodor tour and party at Knapford in the sixteenth season.
They later attempted to get to Callan Castle for Lord Callan's birthday ball, but had several difficulties getting there, such as when Spencer broke down, Thomas got stuck due to branches on the line, and Bertie received a flat tire. They finally arrived in time thanks to Mr. Percival and Harold. They also attended the Earl's Christmas Luncheon.
The Duke wears a dark purple suit jacket, which has a crest on the left side, over a yellow shirt and grey trousers, with a brown boater hat, with a purple band. The Duchess wears a light purple dress, with white collars and pink floral patterns and a brown sun hat. In Timothy And The Rainbow Truck, she wore a rainbow coloured dress.
The Duke of Boxford:
- Matt Wilkinson (UK; Hero of the Rails onwards)
- William Hope (US; Hero of the Rails onwards)
- Shōto Kashii (Japan; eleventh season onwards)
- Volker Hanisch (Germany; Hero of the Rails only)
- Herbert Schöberl (Germany; fifteenth season onwards)
- Ernst Hilbich (Germany; Audio Books only)
- Mieczysław Morański (Poland; Hero of the Rails onwards)
- Helge Winther Larsen (Norway; Hero of the Rails - sixteenth season)
- Gerardo Reyero (Latin America; Hero of the Rails onwards)
- Petteri Hynönen (Finland; Hero of the Rails onwards)
- Ángel Amorós (Spain; Hero of the Rails - fifteenth season)
- Roberto Cuadrado (Spain; sixteenth season onwards)
The Duchess of Boxford:
- Teresa Gallagher (UK; Hero of the Rails onwards - US; seventeenth season only)
- Jules de Jongh (US; Hero of the Rails onwards, excluding seventeenth season)
- Kumiko Itō (Japan; Hero of the Rails only)
- Hiro Nakajima (Japan; Percy and the Calliope and Welcome Stafford only)
- Erina Yamazaki (Japan; sixteenth season onwards)
- Joey Cordevin (Germany; Hero of the Rails onwards)
- Charlotte Hedwig (Germany; Audio Books only)
- Ewa Serwa (Poland; Hero of the Rails - seventeenth season)
- Anna Apostolakis (Poland; nineteenth season onwards)
- Marit Berg (Norway; Hero of the Rails - sixteenth season)
- Rocío Garcel (Latin America; Hero of the Rails onwards)
- Susa Saukko (Finland; Hero of the Rails onwards)
- Olga Kuznetsova (Russia)
- The Duchess' model is currently on display at Drayton Manor.