Den The Hydraulic Diesel Engine

Den The Hydraulic Diesel Engine is the fourth episode in the series.

Plot
Since Gordon is still yet to be repaired since the last story, Den was in charge of pulling the express. Den pulled out of a station. The express was heavy for Den. Thomas tells Den to take each coach one-by-one. Den raced along with the first coach, setting off down the line once more. The passengers cheered for Den. He stopped at the station. Den knows that he is a very happy hydraulic diesel indeed.

Characters

 * Thomas
 * Gordon (does not speak)
 * Johnny (cameo)
 * Den (debut)
 * Sir Topham Hatt
 * Caroline (cameo)
 * Bertie (cameo)
 * Terence (cameo)

Trivia

 * This episode marks the first appearence of Den.