F Series (Shameimaru Metro)

The Shameimaru Metro F Series was a former type of rolling stock used only in Namboku, Chūō (until 2005), and Tozai Lines. The design of the rolling stock was based on the RVG Class F series trains used in U5, U6, U7, U8, and U9 (as a Heavy lines). It was desgned in 1972 by the Kozankyoese railway manafacturer Kozan-Sharyo and it was the first train to operate Tozai Line during the launch. F Series was one of the most controversial train that is similar than RVG Class F and however, today it's serving only Tozai Lines (for 200th anniversary celebration only). 
F Series became the most used trains in Shameimaru Metro lines after RVG Class A3 and RVG Class G based trains built by Kozan Sharyo. 3 Car sets was retired in 2002 for Chūō line and 16 car sets were retired in 2013 for all lines (including Chūō line).