The MOTC ’ s plan called for four routes, several to be high-capacity underground lines. Tai-pei City objected to the fact that the MOTC plan did not serve districts like -Xinyi and Mu-zha, and to meet the needs of these areas proposed an elevated, medium-capacity system.
交通部規劃的數條路線，全採高運量地鐵系統；但台北市府卻認為交通部的版本未將木柵、信義副都心等聯外道路不佳的地區納入服務範圍，擬以中運量的高架系統補足需求。