Maranouchi Train tunnel Korakuen

Maranouchi Line train entering Korakuen Station 後楽園駅 (near Tokyo Dome). See: Coming up for air: trains from the tunnel’s mouth

See also:

And, looking in the opposite direction:

Mouth of the Marunouchi Line tunnel, immediately to the east of Kōrakuen Station, 1957.

View from roof of Kodokan 講道館 (judo headquarters)

Source: https://t.co/uVPzhLGpEW pic.twitter.com/RFUxf2yf4I

— the tokyo files (@thetokyofiles) November 11, 2017