Percy's Plight is a magazine story.
Percy takes some trucks to a siding near to an old branch line. His driver goes off for lunch, but doesn't put Percy's brakes on properly; as a result, Percy moves down the branch line into a big bank of sand. Percy's driver soon raises the alarm, and so the Fat Controller launches a search party. However, none of the engines think to look down the branch line, and so Percy is not discovered until the Fat Controller takes to the skies in Harold.