Frankie is a devious, shifty diesel engine who works at the Mainland Steelworks with Hurricane, Lexi, Theo, and Merlin. She is very controlling and manipulative, and can act rude to others. However, underneath that apathetic and crafty exterior, it is revealed that she only acted the way she did because she just wanted help from other engines due to the busy work schedule that she and Hurricane had.
- Frankie will appear in the series soon.
Frankie is based on a Hudswell Clarke 0-6-0 diesel shunter which worked at the Manchester Ship Canal.