concourse vs railroad station

concourse

noun
  • A large open space in or in front of a building where people can gather, particularly one joining various paths, as in a rail station or airport terminal, or providing access to and linking the platforms in a railway terminus. 

  • The running or flowing together of things; the meeting of things; confluence. 

  • An open space, especially in a park, where several roads or paths meet. 

  • Airport terminal. 

  • A large group of people; a crowd. 

railroad station

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

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