cart vs railroad truck

cart

noun
  • A small, open, wheeled vehicle, drawn or pushed by a person or animal, more often used for transporting goods than passengers. 

  • A small motor vehicle resembling a car; a go-cart. 

  • A cartridge for a computer or video game system. 

  • A shopping cart. 

  • A tape cartridge used for pre-recorded material such as jingles and advertisements. 

verb
  • To carry goods. 

  • To carry or convey in a cart. 

  • To remove, especially involuntarily or for disposal. 

railroad truck

noun
  • A chassis or framework-like structure underneath a railroad car to which wheel axles (and, hence, wheels) are attached through bearings. (Not to be confused with railway truck or railtruck, which are British English synonyms of railroad car) 

How often have the words cart and railroad truck occurred in a corpus of books? (source: Google Ngram Viewer )