Misty Valley lies along a branch line, which is often very misty. This is why Cyril, a friendly fog signalman who lives in Misty Valley, earns his keep by putting detonators on the rails to warn the engines of fog and landslides. Thomas enjoys seeing Cyril, and puffing over the blasting caps due to that they make his axles tingle. That evening, the Fat Controller visits the engines at Tidmouth Sheds to tell them that he has acquired an electric foghorn. He also says that Cyril will not be needed anymore, and will be given a much needed rest. None of the engines are impressed and Thomas is very disappointed to hear this. The foghorn is put on the hillside in Misty Valley.
While Percy is puffing through Misty Valley the following day, the foghorn is sounded. Ironically, after Percy is out of sight, the vibrations from the foghorn create a landslide, which sweeps onto the track and destroys the horn in the process. Thomas comes along, and as the horn is not working, Thomas has no idea about the landslide and derails. Then Toby and Henrietta come along. There is no way of stopping them until Cyril comes to the rescue. He puts down a cap to warn them, just in the nick of time. Once the mess is cleared up, Cyril is reinstated as Misty Valley's fogman.
This was one of the two sixth series episodes that was dubbed in Croatian.
Goofs
In the close-up of Percy at Misty Valley, the tracks in the background lead to the bushes. In the same shot, a wire can be seen in Percy's right-front window. He is also not pulling any trucks in the surrounding shots.
At the beginning of the episode, Thomas' driver has blond hair; after the crash, he has brown hair.
When Thomas runs over the detonator, Annie is facing the wrong way.
Thomas' eyes are wonky after he crashes into the rubble, and when he asks the Fat Controller what Cyril will do.
Throughout the episode, the foghorn is switched on even when it is meant to be off. When the foghorn is first shown, the green light is flashing meaning it is on, but the Fat Controller has not switched it on yet. In a close-up of the Fat Controller switching the foghorn on, the switch is already pointing towards the green light but the red light is still flashing. In another close-up of the foghorn horn blasting in Misty Valley, the red light is flashing even though the switch is pointing to the green one.
In the close-up of James at Tidmouth Sheds, Gordon's tender is loose and a few inches away from his cab.
When Thomas says "Ooh, that made my axles tingle!" his eyes are briefly off-centre from each other.
In the shot of Brendam Docks, Cranky's ladder is on the wrong side.
One of the cattle truck's roof from Thomas' train is damaged.
In the very first shot of Percy puffing through Misty Valley, he has a noticeable wobble.
Quotes
Percy: UK: Oh, bother! / US: Jeepers! That foghorn is so loud it rattles my dome! And it doesn't even make my axles tingle.
