Race to Callan Castle/The Best Engines Ever

Race to Callan Castle/The Best Engines Ever is a two-in-one book.

Race to Callan Castle
Thomas, Bertie and Spencer argue about how many wheels are best and the Duke and Duchess have trouble getting to Callan Castle.

The Best Engines Ever!
Emily wants to be like Caitlin.

Race to Callan Castle

 * Thomas
 * Spencer
 * Bertie
 * Harold
 * Sir Topham Hatt
 * Mr. Percival
 * Lord Callan
 * The Duke and Duchess of Boxford
 * Clarabel
 * Annie

The Best Engines Ever!

 * Thomas
 * Emily
 * Caitlin
 * Victor
 * Connor

Trivia

 * The original title for this book was thought to be Start Your Engines/The Best Engine Ever, but the publisher's website list this book with the title Race to Callan Castle/The Best Engines Ever.
 * It was originally stated to be released for 5 January 2016, but it came forward to the week later.
 * The book is based on the nineteenth series episodes, Best Engine Ever and Two Wheels Good.