Amtrak F40PH lighting?

The roof strobes flash together, not alternatingly. The Red lights in the corners of the eyebrow are the markers. The one between the number boards, I believe is an emergency stop light (I've never seen it used). Ditch lights are ditch lights. 

The roof strobes could flash alternately. It may have been mode-selectable. I saw this personally on the early F40PH's assigned in the Pacific NW. One strobe would "double-pulse", then the other, about once per second. There is a video "Vignettes of the Burlington Northern 3", on which this can be seen. 

I ran a lot of F40's during the 4 years I worked Amtrak passenger trains in the 1980's.  As far as the roof strobes are concerned, both of the flashing sequences described did exist.  Although the lower numbered 200 series  were delivered with alternating strobes, with the passage of time, there was a lack of consistency in which engines flashed which way, probably having a lot to do with the engine house where the engines were maintained.  As strobe control modules were removed and replaced during maintenance or repairs, Amtrak did not worry much about the flashing sequence.  I recall two F40's with selector boxes -- definitely home shop add-ons -- which did absolutely nothing to control the strobe lights.  There might have been a selector on the strobe flash module in the electrical cabinet, but, if so, it was not designed for the Engineer to change it.

Thank you!