"Devious" Diesel
Gender: Male
Basis: British Rail Class 08
Railway: British Railways (formerly), North Western Railway
US Voice Actor: Michael Brandon (2010-2012), Martin Sherman (2013-2014)
UK/US Voice Actor: Kerry Shale (UK: 2010-2021; US: 2015-2021)

"Devious" Diesel is a black diesel shunter who has an oily, devious, scheming, and malicious nature and holds a grudge against the steam engines. Despite this, he still desires to be a useful engine.