headhouse vs train station

headhouse

noun
  • The overground portion of a subway station. 

  • A structure built at the top of a ventilation shaft or mineshaft. 

  • The portion of a passenger railway terminal not housing the tracks and platforms, comprising ticket counters, baggage facilities, etc. 

train station

noun
  • A place where trains stop for passengers to embark and disembark. 

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