Not even in operation yet, and already the QLine streetcars, have been vandalized.
Set to travel all of 3.3 miles of Woodward Avenue, they were apparently not stored in a secure location, which certainly has some interesting implications even as its a commentary on the incapability of some Detroiters to avoid befouling their own nest.
The Detroit Free Press: Detroit QLINE streetcars vandalized with graffiti
Update: I've been informed that the vandalism "ACAB" written on the streetcar isn't due to the vandals receipt of a Detroit Public school system education and thus an inability to tell a taxicab from a streetcar, but apparently it's the urban-dweller acronym for "All Cops Are Bad". Take from that what you will.