Aero-Train is a new concept of environment friendly high speed transport system invented by our group. In order to realize this concept, improvement of the aerodynamic performance is essential. Our goal is to attain the overall lift to drag ration up to 25. Presently it is around 13 to 15. Some of the possible reasons why the value is low are in the interference drag and induced drag around lifting and guide wing junction. Flow separates largely at suction surfaces of the wing section enhanced by the existence of horizontal and vertical walls. Separation control study is conducted in present investigation using CFD and EFD approaches. Drastic improvement of lift to drag ratio was achieved by introducing several devices at the wing section.