The section of the Anacostia Riverwalk Trail from Barney Circle, SE to Benning Road was installed with lights that hang over the trail, similar to the ones over the Metropolitan Branch Trail - except not solar powered. Recently it occurred to me that, at least for the section south of East Capitol Street, I've never seen the lights turned on. I asked DDOT about why the lights weren't turned on and they said that the lights have never worked.
The wiring was stolen shortly after installation and was not replaced. Our engineers are working on the best way to fund and restore the wiring so we can turn the lights on.