Nashville transit advocates are left pondering the future and examining what went wrong after a transit ballot referendum was defeated in the May 1 Tennessee primary. The referendum, which was made possible by state legislation approved last year, would have increased four taxes to fund a multi-billion dollar transit plan that included five light rail lines, a tunnel under downtown, new electric buses, bus rapid transit lines and two-dozen new neighborhood transit centers. Sixty-four percent of voters rejected the measure and the defeat appears likely to have potential long-term implications for the city’s transportation system, politics and economic interests and could provide lessons to other communities around the country that may be looking to upgrade transit offerings in the years ahead.