The latest issue of First & Fastest has a photo of the outer ends of the platforms with dwarf signals displaying red, with two white lights in a horizontal row above; the white lights do not appear on other signals farther into the interlocking. Does anyone know the significance of the white lights, and what other aspects there are? I remember the C&NW dwarfs with a red semaphore arm painted on a white disc, and the last time I was there they had what appeared to be B&O-type position-light dwarfs, but I haven't seen these before.