A Most Singular Engine

S21, E2: Diesel is sick and tired of hearing Daisy the Diesel Railcar describe herself as “a most singular engine”. So when Diesel overhears Thomas describing not Daisy but Harvey as "one of a kind a unique engine" he spots the chance to make mischief! Diesel goes back and forth telling Harvey and Daisy that the other engine is boasting about how he or she is most uniquely Useful. This bothers Daisy and gets stuck in Harvey’s boiler… until they meet and help one another out! Harvey clears Daisy’s way using his crane and Daisy picks up some passengers to save Harvey having to collect his coaches. Later on Diesel doesn’t understand how two engines – both so different – can be friends. But Daisy and Harvey get along not because of how they look – but for what they do!