road vs steam engine

road

noun
  • A railway or (UK, rail transport) a single railway track. 

  • A partly sheltered area of water near a shore in which vessels may ride at anchor; a roadstead. 

  • A path chosen in life or career. 

  • A way or route. 

  • A way used for travelling between places, originally one wide enough to allow foot passengers and horses to travel, now (US) usually one surfaced with asphalt or concrete and designed to accommodate many vehicles travelling in both directions. In the UK both senses are heard: a country road is the same as a country lane. 

  • Roads in general as a means of travel, especially by motor vehicle. 

  • An underground tunnel in a mine. 

adj
  • At the venue of the opposing team or competitor; on the road. 

steam engine

noun
  • A steam locomotive. 

  • A piston engine driven by steam (as contrasted, for example, with a steam turbine). 

  • Any heat engine that uses steam as its primary working fluid to do mechanical work. 

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