Annie and Clarabel are Thomas' coaches, whom he loves very much.
Annie and Clarabel were given to Thomas when he started working his own branch line. They have had several adventures, such as losing their guard and becoming runaways.
When Thomas is away, Percy, Toby, Duck or Stanley takes his place to pull them. Emily and Neville have both taken them not knowing they were Thomas' coaches, and Caitlin has once taken them without realising they were coupled to her own coaches.