The team, led by Sonoma resident Eric Houston and his friend Marco Fucci di Napoli, will seek to add not only a new entry to the famed record book but test an open question: How fast can a solar-paneled rail car with no onboard energy storage go? With Napoli and Houston aboard, the goal on Saturday is to test the upper limit of solar energy as a form of rail transportation, said Houston, 45. Friday’s tests, blessed by Northwestern Pacific Railroad, started south of Sonoma at the Schellville Depot, where Napoli, Houston and their team conducted safety tests ahead of Saturday.