The artist John Theodore Kenney is among those nominated for the posthumous prize in Leicestershire, UK.
The plaque awards figures from the city who have lent heritage to the region with voting open till April 7th on the city council's website.
Kenney lent his illustrations for six books from 1957's The Eight Famous Engines until 1962's Gallant Old Engine.
Also part of the shortlist is Henry Wills, printer and founder of Ladybird Books. The company is known to Thomas fans for adapting the first two television series in book format during the 80s.
Thanks to SiF for the alert.