Before coming to Sodor, Zach worked on a railway in Wales. But after a major failure, Zach was to be sent to a scrapyard. When he heard about it, The Thin Controller saved him and restored him. Now, Zach works on The Skarloey Railway pulling passengers and working as a shunter with Fred. When he started work, Sir Handel was jealous. He wanted to be the only blue engine on their railway. But when Sir Handel broke down on his passenger run, Zach was sent to help and quickly changed Sir Handel's thoughs about him. After that, Zach became great friends with not only Sir Handel, but the rest of the narrow gauge engines. That made Zach feel right at home.