el vs elevated railway

el

noun
  • An elevated railway, especially for specific systems such as the metro in Chicago. 

  • The name of the Cyrillic script letter Л / л. 

  • The name of the Latin-script letter L. 

num
  • The cardinal number occurring after dek and before do in a duodecimal system. Written ↋, decimal value 11. 

article
  • the 

elevated railway

noun
  • a rapid transit railway with the tracks above street level on a viaduct or other elevated structure 

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