text: Cynthia, If we ever make the mistake of putting rail at-grade, even minor collisions between a car and the train will shut the entire system down temporarily, and one fatal collision between a truck and the train will shut the system down for hours.  About 9% of the vehicles in Hawaii are not even insured.  Keep rail separate from traffic.  Don't mix rail with dumpsters, garbage trucks, emergency vehicles, and shopping carts.