Recent visitors to Vietnam have likely marvelled at the newly-soaring skylines of capital Hanoi and Ho Chi Minh City, or Saigon, the biggest urban area in what has been for two decades one of the world’s fastest-growing economies and a hub for the likes of Intel and Samsung. But holidaymakers will soon be treated to a blast from the past, after two old steam trains were refurbished by engineers from state operator Vietnam Railways for commercial use in the centre of the 1,650-kilometer-long country. Built in the 1960s, shortly after the end of French colonial rule and as the Vietnam War was in…