Definition

Noun: 1. (Nautical) A small auxiliary engine, typically used on ships to power machinery such as a windlass (a winch for hoisting anchors or heavy weights). 2. (Railroad) A small locomotive used for moving and arranging railroad cars within a yard or workshop; a switcher or shunter.

Usage Examples

• Nautical Context:
  • The crew used the donkey engine to raise the heavy anchor.
  • A reliable donkey engine is essential for operating the ship's cargo winches.
• Railroad Context:
  • The donkey engine shuffled the freight cars onto the correct track.
  • Before the main locomotive was attached, a donkey engine assembled the train in the yard.

Advanced Usage

• The term is historical and evokes early industrial or maritime technology. In modern contexts, more specific terms like auxiliary engine, winch engine, or switch engine are often used.
• It can be used metaphorically to describe a small, hard-working machine or system that performs essential but unglamorous tasks.

Variants and Related Words

• Switch Engine (n.): The standard railroad term for a locomotive used for switching cars.
• Shunter (n.): (Chiefly British) Equivalent to a switch engine.
• Auxiliary Engine (n.): A general term for a secondary engine used to support main operations.

Synonyms

• Nautical: Auxiliary engine, winch engine.
• Railroad: Switch engine, shunter, yard goat (slang).

Notes on Different Meanings

The two primary meanings are distinguished entirely by context—maritime/nautical versus railroad. Both meanings share the core idea of a small, secondary engine for heavy, specific tasks.

Noun

1. (nautical) a small engine (as one used on board ships to operate a windlass)
2. a locomotive for switching rolling stock in a railroad yard