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On 23 June 1993, the Ministry of Transport issued approval to the Teito
Rapid Transit Authority to start construction of an extention of subway line
N0.11 (Suitengu-Oshiage).
The Eastern part of the Metropolitan area has become the most congested
area in Japan in recent years, to such an extent that some railway lines recorded
a congestion ratio of more than 250%. This has been caused by the delays in
railway development even though the population in the area had increased dramatically.
As the flow of passenger traffic is expected to shift due to the extention of
subway line N0.11 to Oshiage, which will connect to the Isezaki line of Tobu
Railway. By the mutual use of tracks, the congestion in Kitasenju station, which
is the major transfering station of the area for the JR Joban line as well as
the Chiyoda Subway line should be allevicated.
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