What is the meaning of the word "yard donkey"?

Definitions:

  1. A small mobile crane or loader used in freight yards for unloading, stacking, and moving cargo. copy to clipboard NOUN
    • The yard donkey's compact size and powerful engine make it ideal for moving heavy loads around the terminal. copy to clipboard
  2. Refers to a small, powerful vehicle or piece of machinery used for moving heavy loads in confined areas, especially in logistics and transportation industries. copy to clipboard NOUN
    • The yard donkey moved the container swiftly from the loading dock to the storage area. copy to clipboard

Synonyms: