Calley, a shunting engine, is Dunbar's feisty assistant. She has her own set of service cars to perform her many different tasks. She loves to use her flashing yellow warning lights when she's out on an emergency and is like a big sister to the trainees. Her catchphrase is "Absotootly!" Box car features sliding door. All Chuggington StackTrack engines are compatible with Chuggington StackTrack playsets, creating the ultimate action-packed train play experience! With a wide assortment of collectible characters and exciting playsets, children can recreate favorite Chuggington episodes or new adventures. Build multiple layouts and higher than ever before with sturdy risers and easy-to-connect track (StackTrack playsets sold separately).