Interesting Difference Between 12th and 19th Street Stations

As many of you should know, the 12th and 19th street stations in Oakland are identical except for the fact that the bricks are different colors. Well, here's another difference between the two stations that I find to be interesting. You know how at both stations, there are several escalators that go directly down to the lower platform from the concourse. If you're riding an escalator down to the lower platform at 12th street, as soon as you get below the upper platform on the escalator, there are florescent light fixtures right above you, but at 19th street, there are no florescent light fixtures above the escalators that go to the lower platform. Does anyone know why that is?

Train Operator since 2003's picture

Building codes.