The Whistling Woods is a woodland area on the Ulfstead Branch Line. Toby had a fear of the strange noises in this woods, but Thomas and James helped him overcome his fear. The woods has a woodland waterfall and is home to Thomas' friend, the snowy owl.
There is also a meadow of flowers just outside of the forest. Thomas once went there when he was delivering beehives for Farmer Trotter. However, the bees escaped and would not come back to their hives.
It can be accessed via the Whistling Woods Junction.
- Hiro's Hideout is located in these woods.