Duncan Gets Spooked is the 128th episode of Thomas and Friends
Duncan, Peter Sam, Skarloey and Rusty are busy clearing their line of branches and debris. After Rusty helps Peter Sam to the water tower with his train, Peter Sam's trucks break away and roll onto a bridge where they derail and plummet into the ravine.
The Fat Controller punishes Peter Sam by making him work in the yards until he can trust him again. Duncan chortles that Peter Sam's trucks will return to haunt him, so Rusty tells him of an engine who long ago, tried to cross the same bridge over the ravine but derailed halfway across and fell into the swamp below. And ever since that night, his spirit has haunted the bridge. Duncan is dismissive, but Peter Sam's driver gets an idea. He and Duncan's crew plan to teach Duncan a lesson and take him to the bridge.
That night when Duncan is just about finished with his work, he is halfway across the bridge and then stops. He begins to see flickering lights that look like an engine in front of him, (though it is actually just an engine formed by fireflies) then Duncan's crew secretly throw a large rock from the cab and into the ravine below. Duncan, thinking it is the ghost of the engine, gets scared and quickly runs back to the safety of his shed.
- Peter Sam