A proposed $4-billion privately built high-speed rail line between Las Vegas and Southern California won’t begin construction in early 2020 as planned, due to the developer’s inability to secure tax exemptions from the Nevada legislature this session. Virgin Trains USA had sought partial exemptions to sales and property taxes, which the company considers integral to the 185-mile project’s financing strategy. Because Nevada’s legislature convenes every two years, Virgin Trains will have to wait until 2021 before renewing efforts for the tax exemptions.