The Urban Underground Space Center of Japan (USJ), composed of public, private and academic sectors, aims at utilizing urban underground space through various activities like research, study etc. This paper is the second report of the Yaesu-Kyobashi-Nihonbashi Committee USJ’s Three - year project on planning of new underground railway station supposed to be constructed near Tokyo Station once the railway network is to be realized, connecting Tsukuba and Haneda Airport and running through near Tokyo Station, Tokyo Bay Area etc. This research is vital for Yaesu-Kyobashi-Nihonbashi district as many redevelopment projects are carried out vigorously in conjunction with sharp increase in the volume of passenger traffic passing this district.

This time, we mainly report the purpose and role of new underground railway, and the comparative study of route plans. The route plans of A, B and C are compared in terms of the three elements – construction costs, accessibility to the existing Tokyo Station and contribution to revitalization of the district.

As a result of the study, it was suggested that it would be desirable to build a new underground railway under the Chuo-dori street from the viewpoint of town development of this district.

日本城市地下空间中心（USJ）由公共、私人和学术部门组成，旨在通过研究、研究等各种活动来利用城市地下空间。本文是八重洲-京桥-日本桥委员会 USJ 的第二次报告铁路网建成后将在东京站附近建设新地下铁路站的三年计划项目，连接筑波和羽田机场，并贯穿东京站附近、东京湾区等。这项研究对八重洲至关重要-京桥-日本桥地区随着通过该地区的客运量的急剧增加，许多重建项目正在大力进行。

本次主要报道新建地下铁路的目的和作用，以及路线规划的比较研究。A、B 和 C 的路线计划根据三个要素进行比较——建设成本、现有东京站的可达性和对地区振兴的贡献。

研究结果表明，从该地区城镇发展的角度来看，最好在中央大道下修建一条新的地下铁路。