train ferry vs wharf

train ferry

noun
  • A ferry used to transport rail vehicles from one railway line to another across a stretch of water. 

wharf

noun
  • A man-made landing place for ships on a shore or river bank. 

  • The bank of a river, or the shore of the sea. 

verb
  • To place on a wharf. 

  • To secure by a wharf. 

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