Oimachi Line starts from Oimachi Line in Keihin-tohoku Line, crosses most lines of Tokyu (Ikegami, Meguro and Toyoko) and reaches Furako-tamagawa (known as 'Nikotama' in slang) in Dennentoshi-line. Long time, only all the serices are local, but recently express (rapid) service has started. Series 6000 is dedicated to this express.