streetcar vs tramcar

streetcar

noun
  • A tram or light rail vehicle, usually a single car, but also attached together, operating on city streets. A trolley car. 

tramcar

noun
  • A streetcar. 

  • A rail vehicle for carrying loads in a mine; a tram. 

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