A collection of four stories chronicling the adventures of several railway engines. On the Fat Controller's Railway trucks disappear, some bees escape, and a green hat is mistaken for the guard's flag! Two new mischievous twin engines, Bill and Ben, are introduced to the system and BoCo the diesel is a newcomer too, but how useful he proves to be. 21.1 The Diseasel 21.2 Buzz Buzz 21.3 Wrong Road 21.4 Edward's Exploit