http://www.cincinnati.com/story/news/2015/11/09/power-switch-goes-streetcar-tuesday/75472994/
“The main testing phase calls for the system’s overhead power lines to be turned on, and the streetcar will be driven without paying passengers through the streets of OTR. The federal government requires each streetcar to run for 300 miles without incident before a vehicle can be approved safe enough to open to the public.”