Knapford Harbour is situated west of the railway station. It was under construction in Percy the Small Engine with stone from Anopha Quarry being brought in to build it. However, not long after its completion, the foundations of the quay began to sink. It was here that Percy took a dive into the harbour's waters.
Later, Percy pushed several trucks full of stone into Bulstrode's hull. After the accident, Bulstrode was towed to a nearby beach.
In the television series, it only appeared in the second, third, and fourth seasons.