The Atlanta Streetcar will undergo its first test under power Wednesday, making its first trip around the 2.7-mile route while powered by its overhead wiring system.

The first test will be conducted at a slow speed of 5 mph to allow simultaneous tests of other vehicle systems. The electric streetcars are powered by an overhead wire carrying 750 volts DC. All four streetcars must undergo and pass a battery of tests to be ready for passenger service later in 2014.

The test of the first streetcar will take begin at about 11 p.m. Wednesday and continue until the early morning hours of Thursday.

Spectators are asked to remain on the sidewalks and not to approach the streetcar stops during testing. The Atlanta Police Department will escort the vehicle along the route.

The test will start along Auburn Avenue at Fort Street and continue through Woodruff Park, north on Peachtree Street, west on Ellis Street to Carnegie Way and Andrew Young International Boulevard. The vehicle will then turn south on to Centennial Olympic Park Drive, head east on Luckie Street, south on Park Place, east along Edgewood Avenue, north on Jackson Street, and complete the loop on Auburn Avenue.

Rolling closures will take place along the streetcar route and traffic may be delayed. Motorists are advised to take alternate routes during testing.