Those of you who lived near Kami Kumamoto might have used this train.
http://ajw.asahi.com/article/cool_japan/style/AJ201511030004
Last 'green frog' train running in Kumamoto headed for final run after 60 years - AJW by The...
KUMAMOTO--With a rigid suspension and no air conditioning, a ride on Kumamoto Dentetsu Co.'s Kikuchi Line's "aogaeru," or green frog, does not offer the passenger comforts of a modern train.