Stepney, named after a district in London, is a tank engine from the Bluebell Railway. He is Boxhill's brother. Stepney is a bubbly, honest and humble chap who is busting with enthusiasm. He is every engine's friend. Even if an engine might not like him at first, his personality wins them over. After being saved from scrap by Rusty and the Bluebell Railway, he now runs his own branch line, but loves helping out on The Fat Controller's railway. He has an enthusiasm for learning and listening to advice, as well as keeping busy. Stepney can feel down in the dumps if he does not get enough work to do or if he does not get a good long run to stretch his wheels. Stepney is high-spirited, lively and is keen to see fair play. He is popular amongst the other engines and is always game for more work.
Stepney is based on the real engine of the same name, an LB&SCR A1x Class "Terrier" 0-6-0T tank locomotive. He is Boxhill's brother.