Rail enthusiasts found reason to celebrate on Friday amid a coronavirus outbreak gripping Hong Kong, cheering and popping champagne at the opening of the first part of the city’s most expensive railway project.More than 100 people queued outside the newly opened Kai Tak MTR station to board the inaugural service on the Tuen Ma line phase 1, departing at 5.45am. The line is the first part of the HK$99.1 billion (US$12.7 billion) Sha Tin-Central link to launch since construction began in June…