CNN  —  A dozen years after it broke ground, Vietnam’s largest city has unveiled its first mass rapid transit line. Hundreds of people lined up for the chance to be among the first passengers to board Metro Line 1 as it began operations in Ho Chi Minh City on Sunday, according to state-run news agency Viet Nam News. The line stretches from busy Ben Thanh market in the city center to the Soui Tien Theme Park outside its northwestern boundary, with 14 stops – three underground and 11 above. Its