The dispatcher had displayed a Medium Approach (Y/*R*) signal on the 2N dwarf signal at CP-HATCH in Pennsauken to give NS train 39G room to assemble its train. The train likely didn't need all the room it was given, but advanced just far enough to knock down the signal so that the dispatcher would not need to run time.
This is an example of how a three lamp dwarf can display some "two head" signal indications.
