Probably just never got taken down. Lot of pics of those signals in Mike Bednar's book from the 1970s.
The two bottom signals are gone (stolen?) but the two tops ones are there complete with glass lenses. I was corresponding with NS person in charge of real estate about them and he said I couldn't take them down. I told him they'd probably get smashed when the line becomes a rail-trail and he was like "yes so what".
It's a very sad sight. There are pics from the 1940s from the tower that guarded the LNE diamond Charlie Bealer took. Frieght stations, scales, passenger station, huge yard, 4 track LV main, Reading C&F Branch, Ironton RR. All gone. Today just muddy grass.