Thomas does not wait for his load of pipes to be tied down at the shunting yards and when he rounds a sharp bend, the pipes fall off his flatbed and Hiro derails. Thomas feels guilty, especially when he fears the Steamworks will not have any spare parts for him. Wanting to help his friend, Thomas ventures into Hiro's old hideout to see if he can try to salvage some left behind parts for Hiro.

Spencer has to take the Duke and Duchess of Boxford to Castle Lochfor Lord Callan's birthday and he, Thomas and Bertie start boasting about which amount of wheels are best, but Spencer's valve gear snaps, so the Duke and Duchess decide to ride in Thomas instead, who gets stuck behind a fallen tree, then they ride in Bertie who gets a wheel flat after driving over some nails laying in the road, then Mr. Percival calls Harold the helicopter so he can take them to Castle Loch.