Hiro's Hideout is a siding where Hiro was left when he began to break down. It is located in the Whistling Woods and is near The Duke and Duchess of Boxford's Summer House on the Ulfstead Branch Line. Thomas rediscovered Hiro here.
When Hiro was involved in an accident years later, Thomas ventured down the siding to find any spare parts that would have been lying down to speed up his repairs, but derailed when the track under him broke. He was later found by Harold.