Well. You already know it. Hi. My name is Bob. Bob lenson. And I'm driver of the nwr number one tank engine. Known as Thomas

He works on the Farquhar branchline such as Percy. Toby. Mavis. Daisy and Timothy. He pulls his two coaches Annie and clarabel

Okay Percy has gone missing and someone has to take the mail train but who? Thomas? Toby? Daisy? Mavis? Timothy?