The line was named after the Ginza commercial district in Chūō, Tokyo, under which it passes. On maps, diagrams and signboards, the line is shown using the color orange(G), and its stations are given numbers using the letter "G".
Almost all Ginza Line trains operate on the line's full length from Asakusa to Shibuya. However, two trains depart in the early morning from Toranomon, and some late-night trains from Shibuya are taken out of service at Ueno. Along with the Marunouchi Line, it is self-enclosed and does not have any through services with other railway lines.
On weekdays, trains run every two minutes in the morning peak, every 2 minutes and 15 seconds in the evening peak, and every 3 minutes during the daytime. The first trains start from Shibuya and Asakusa at 05:01, and the last ones reach Shibuya at 00:37, and Asakusa at 00:39.
Being the oldest line on the Tokyo Metro, stations are also the closest to the surface—generally no more than one and a half stories underground. The western end of the line emerges to the surface and enters Shibuya Station located on the third-floor of a building that is located in a depression.
According to wikipedia