curricle vs dray

curricle

noun
  • A light two-wheeled carriage large enough for the driver and a passenger and drawn by a carefully-matched pair. 

dray

noun
  • A low horse-drawn cart, often without sides, and used especially for heavy loads. 

  • A kind of sledge or sled. 

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