title: Class S
text: # Class S
  
  Class S may refer to:
  
  * Class S (culture), early 20th century Japanese social practice of female romantic friendships, and a literary genre depicting this practice
  * Class S, a stellar classification for carbon stars
  * Baltimore and Ohio class S, American steam locomotives
  * BNCR Class S, Irish steam locomotive
  * GNRI Class S, Irish steam locomotive
  * South African Class S 0-8-0, steam locomotives
  