Dock shunter

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This article describes UK usage. United States usage may be different.

A dock shunter, "dock tank", or "docksider", is a locomotive (formerly steam but now usually diesel) used for shunting wagons in the vicinity of docks. It is usually of 0-4-0 or 0-6-0 wheel arrangement and has a short wheelbase and large buffers. These features make it suitable for negotiating sharp curves.