"Diesel is a standard Class 08 shunter from the mainland. He came to the
shed "on trial", but he quickly upset the other engines and was sent away
in disgrace. Later on, when an emergency arose and Sir Topham Hatt sent
for a spare engine, he was not pleased when Diesel was the only one
available. But Diesel's behavior improved slightly on this visit, and
the bad feeling against him is now less strong than it was."
"Devious Diesel, the other engines call him behind his back and
sometimes (when he's been more than usually obnoxious) to his
face. Oily, scheming and ever ready to stir up trouble in the
shed, his characteristic smirk is a sure sign that somebody,
somewhere is in for a bit of trouble."