Thomas is on his branch line when a passenger pulls the emergency cable and he has to stop quickly. But it turns out not to be an emergency at all, but a bird watcher who has spotted a rare bird. To make matters worse, Clarabel has a wheel flat after being dragged along with her brakes on. So the next time Thomas sees the bird watcher he refuses to stop to collect him, but he soon learns that that is not the right thing to do.
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