raceway vs trunking

raceway

noun
  • The canal for the current that drives a water wheel. 

  • An easily-accessible conduit or tray for organizing runs of data or power cabling. 

  • A place where races are held; a racetrack. 

trunking

noun
  • A system of ducts for cables, heating or ventilation. 

  • The movement of containers or packages between a terminal and a transporter's inland facilities, or the scheduled transportation service between locations. 

  • All the electrical and communications cables bundled together and distributed through a building. 

  • Plastic conduit or duct used to conceal and protect electrical wiring. 

  • A two-way radio technique that uses a control channel to automatically assign frequency channels to groups of user radios. 

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