The nation’s first privately funded high-speed rail line, which would connect Las Vegas with Southern California, remains in a holding pattern, awaiting a decision on a federal government loan, a representative of the company said today. Andrew Mack, chief operating officer of XpressWest, told the Las Vegas Convention and Visitors Authority board of directors that his company is still awaiting word on approval of a $5.5 billion loan. The $6.9 billion train project would link Las Vegas and Victorville, Calif., and, eventually, downtown Los Angeles via Palmdale, Calif.