Diesel is a devious diesel shunter who despises steamies.
- Take-n-Play version (uni-polar magnets, angry face, made in China) (2010-2012)
- Take-n-Play version (smiling CGI style face, updated body, made in Thailand) (2012-2014)
- Take-n-Play version (bi-polar magnets) (2015-2016)
- Adventures/Collectible Railway version (hook and loop couplings) (2014-present - Europe/Asia) (2017-present - US/UK)
- Talking Diesel (Take-n-Play)
- Diesel's Spider Delivery (Take-n-Play)
- Tales from the Past Engine (Take-n-Play)
- Pull 'n Zoom! Diesel (Take-n-Play)
- Diesel's Mine Discovery (Take-n-Play)
- The 2012 Take-n-Play Diesel is one of the few engines to have siderods mouled in the chassis. Other characters include Timothy, Iron 'Arry, Iron Bert, and the 2013 Paxton and Sidney.
- The prototype 2012 Take-n-Play Diesel features white wheels instead of black ones.