road accident vs train wreck

road accident

noun
  • A collision on a road, typically involving one or more motor vehicles, but also including cyclists and pedestrians knocked down by vehicles. 

train wreck

noun
  • The aftermath of a train crash. 

  • A disaster, especially one which is large in scale and readily seen by public observers. 

  • Someone (especially a woman) who is unbalanced and considered a mess, a disaster, one who is suffering personal ruin. 

verb
  • To ruin utterly and catastrophically, to cause to end in disaster. 

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