Stepney is a cheerful tank engine who lives on the Bluebell Railway.
Stepney was to be scrapped until he was saved by the Bluebell Railway Preservation Society. Shortly afterwards, Stepney was invited to come and visit the Island of Sodor. When he arrived, Thomas the Tank Engine was jealous as his branch line was no longer "The Pride of the Line", as he put it. Thomas and Stepney soon became firm friends. Stepney was soon invited to leave the Sodor Main Line and assist his new friend on his own Ffarquhar Branch Line. Stepney had a run-in with some cricket players, and their one and only ball got lost in one of Stepney's hay wagons. Determined to get their ball back, the cricket players and Caroline the Old Car chased after him! Stepney helps a rude diesel receive his comeuppance when he gets a bowler hat lodged in his air intake. After shunting him aside, he and Duck take the Diesel's train.Soon afterwards, Stepney went home, but he promised that he would visit soon.
Indeed he did, and he was sent to work at Anopha Quarry with Toby and Mavis when extra help was needed. However, Stepney was mysteriously sent in the "wrong direction" due to someone setting the points. He ended up at Sodor Ironworks where 'Arry and Bert were prepared to incinerate him! Luckily he was saved by the Fat Controller, who sent him home safely soon afterwards.