locomotive vs switcher

locomotive

noun
  • The power unit of a train that pulls the coaches or wagons. 

  • A country which drives the world economy by having a high level of imports, such as the United States. 

  • A cheer characterized by a slow beginning and a progressive increase in speed. 

  • A traction engine. 

adj
  • Of or relating to the power unit of a train which does not carry passengers or freight itself. 

  • Of or relating to locomotion. 

switcher

noun
  • A railway locomotive used for shunting; a shunter. 

  • A switchmode power supply. 

  • Synonym of vision mixer (“device for selecting between video sources”) 

  • One who or that which operates a switch. 

  • One who or that which switches, or changes to something else. 

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