Why is the signed as Sea Beach Express when there's only one set of rails that are used anyway? And if they were to use the center rail for revenue service (aside from current use with the station rehab), the current 's route would be the local variant of sea beach.
My guess is it's the MTA's way of implying the runs express on 4 Av (why not just say Astoria Local, Broadway Local, 4 Av Express, Sea Beach Local on the LED display though? Is it too wordy?).