May the Best Engine Win
EMILY, THE NEWEST engine, is determined to prove that she is as Really Useful as Thomas, so she challenges Thomas to a race: whoever can do the job the fastest is the winner. Soon they are off, each on a whirlwind rush around the Island of Sodor. But they both realize that speed is only part of being Really Useful . . . the work must be done right.
From the Hardcover edition.