6000 Series moved from JR East and renamed from 205 Series. 205 Series had been in service in 1985. It was first Japan National Railway (JNR) car made by stainless steel and equipped bolsterless bogies and superimposed field excitation control system; classical series-wound motor and resistance unit are equipped, but a loop of current circulating around magnetic generator via circuit in parallel with field coils of motors and the field coils and flowing in a direction reverse to that from pantograph to railway in the parallel circuit and field coils to control the amperage of the coils, and has a merit to equip regenerative brake.
Four 3-car sets are existed and all of those had been in service on Yamanote Line and Keiyo Line while they used to belonged to JR East.
The cars in upper photograph is 6001F set (Yate 2, when in service on Yamanote Line, Keyo 25, when on Keiyo Line) equipping double hung window at Higashi-katsura Station, and that in lower ones is 6501F (Yate 11, when in service on Yamanote Line, Keyo 22, when on Keiyo Line) having sashless vertical sliding window from the platoform of Tsuru-bunka-daigaku-mae [Tsuru University] Station.
JR East 189 Series, debuted in 1975 as the car for "Asama" limited express between Ueno Stataion and Nagano Station or Naoetsu Station and at first dedicated to steep slope on Shinetsu Main Line between Yokokawa Station and Karuizawa Station coupled with two Class EF63 electric locomotives, also go through Fuji Kyuko Line as "Holiday Rapid Mt.Fuji" on Saturdays, Sundays, and Japanese national holidays. The one in upper photograph is M51 cream-and-red-coloured (livery of traditional JNR limited express train) set shot at Mitsutoge Station over the front window of the train toward Otsuki, and the one in lower is M50 white-and-blue-coloured (livery of "Azusa" limited express after the privatization of JNR) set, which operated on Fuji Kyuko Line last time on that day, shot at Yamuramachi Station over the front window of the train toward Otsuki.