express train vs turbo

express train

noun
  • A train (either the service or the train itself) making limited stops. 

turbo

noun
  • a turbine 

  • A turban shell. 

  • Autofire. 

verb
  • To autofire. 

adj
  • Very, super, etc.; usually relating to a qualitative value (as opposed to quantitative). 

  • Causing or relating to increased speed. 

  • With rapidly-increasing blind levels. 

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