Thomas & Friends Trivia or Fun Facts Game

Hmm. Trick question, per chance? If it's the Railway Series, it would be the Ballast Regulator; Television Series, Whiff.

Nice one HankAmerican Engine, here he is in the story 'Ballast' in 'Small Railway Engines' (again!), replacing dirty ballast on the NW Railway with the lead-polluted and therefore weed-killing ballast bought down from the old lead mines by the Small Engines on the Arlesdale Railway, which was built for that purpose.