(VOVWORLD) - The Vietnam Railway Authority has asked the Ministry of Transport to call for foreign investment in six projects: a railway running to the northern port city of Hai Phong, the Bien Hoa-Vung Tau and Trang Bom-Hoa Hung projects in the south, an eastern ring railway in Hanoi, the light railway linking Thu Thiem with Long Thanh International Airport, and the Vung Ang-Tan Ap-Mu Gia rail route in the central region.