The engine drivers (sometimes called engineers in some US narrations) drive and maintain the engines and, along with the fireman, keep the engines in control and provide a voice of reason when an engine is being difficult.
A North Western Railway steam engine driver's uniform consists of dark blue trousers, a black tie, a white shirt with a blue jacket with light blue accents over it and a blue peaked cap. This dress code is the same for drivers on the Arlesdale Railway.
Diesel engine drivers wear a similar, though less formal, uniform, with the Vicarstown Dieselworks logo on the jacket and a brown cap.
The drivers on the Skarloey Railway wear the same outfits, but in grey instead of blue.
From the ninth to sixteenth seasons of Thomas & Friends, drivers and firemen act almost purely as background characters and are very rarely acknowledged. Engines have on numerous occasions left their jobs without consulting their drivers (if they have any), when in reality, the driver would direct the engine where to go and what to do. But from the seventeenth season onwards, drivers have been seen and spoke more often and have worked more realistically.
There have been complaints about the lack of female drivers. Mary Creagh, a Labour Front-bencher, has said it was a negative stereotype, and says it will make women less likely to become train drivers if they are put off in their early years. She also criticised the lack of female characters. HiT Entertainment responded saying there has been a "historical imbalance" but that there will be more female characters/engines in development.
Douglas/Glynn's driver is the first driver in the series to have ginger hair.
In the 2004 magazine story, Emily's Slide Show, it is revealed that Emily had a different driver before she came to Sodor.
Donald's driver is one of the few to have grey hair in the model series.
In Thomas and the Magic Railroad, live-action actors are used throughout the film. However, Bertie's driver appears as a figure instead. In the twelfth season, despite human characters being portrayed in CGI, Bertie's driver also remains as a figure instead.
In the model series, Bertie's driver had a moustache. However, when the show switched to CGI, he is clean shaven.