Oliver the Western Engine is an anthropomorphic steam engine in Sodor.
The Railway Series books by the Rev. W. Awdry (and his son Christopher Awdry) and in the television adaptation Thomas & Friends. Oliver is a Great Western 1400 Class tank engine who works on Duck's Branch Line ("The Little Western"), and he lives on the Island of Sodor.
In addition, Oliver has two ex-GWR Autocoaches (by the names of Isabel and Dulcie) and a GWR Brake Van by the name of Toad.