Thomas and the U.K. Trip (Japanese: きかんしゃトーマスとイギリスのたび) is a Thomas/"Ponkickies" crossover. It aired in December of 1991 exclusively in Japan.
Two children's television characters from Japan, Gachapin and Mukku, visit the United Kingdom. During their visit, they come to Sodor to meet Thomas, Sir Topham Hatt, and the other engines. During the second half, they visit real railways and learn how steam locomotives work.
- Sir Topham Hatt
- Henry (does not speak)
- James (does not speak)
- Edward (Introduction only)
- Toby (Introduction only)
- Duck (Introduction only)
- Donald and Douglas (Introduction only)
- Oliver (Introduction only)
- Bill and Ben (Introduction only)
- Mavis (Introduction only)
- Bulgy (Introduction only)
- Diesel (cameo)
- BoCo (cameo)
- Annie and Clarabel (cameo)
- Henrietta (cameo)
- Bertie (cameo)
- Trevor (cameo)
- Harold (cameo)
- Tidmouth Sheds
- Shepperton Studios
- Buckinghamshire Railway Centre
- Kent & East Sussex Railway
- Great Western Railway (mentioned)
- Keiko Toda as Thomas
- Kenji Utsumi as Gordon
- Chisato Nakajima as Percy
- Kōhei Miyauchi as Sir Topham Hatt
- Kuniko Amamiya as Gachapin
- Juuji Matsuda as Mukku
- Izumi Tachibana as facilitate
- This marks the first time Oliver, Mavis, and Bulgy's nameboards are seen.
- Bulgy's was introduced as "バルギー(Barugī)" instead of "バルジー(Barujī)".
- An instrumental version of The Beatles song "Ob-La-Di, Ob-La-Da" is used at one point. Ringo Starr has played instruments in that song.
- The scenes of Thomas and his friends interacting with Gachapin and Mukku were filmed during the production of the third season.
- Thomas' Anthem is played in English.
- When Thomas is talking to Gachapin and Mukku, a wire is hanging from underneath Thomas' running board.
- Henry's firebox is crooked.
- When James and Henry puff out of the shed, they are going slowly, but the sound of them puffing is fast.