Rick,
There was a previous thread on this topic several months ago. You may
want to reference that. The lower two lights, which were in the
standard EMD housing, were the normal headlight that were
repositioned to make room for the higher mounted Mars. The Mars
lights on the GP units were similar if not identical to those used on
Q steam locomotives. The white light in the Mars housing usually
gyrated, (in a figure 8 pattern IIRC) but could be placed in a fixed
position anywhere in it's rotating cycle. Neither light was designed
to flash. The red light was wired so that it only came on in an
emergency brake application. It was not a running light. If a GP unit
was making a reverse movement, there were red lenses in the class
light assemblies to provide rear marker lamps. Generally, at night,
both the fixed road headlight and the white Mars light were on. In
the daytime, depending on the time period, there was no light or just
the fixed headlight.
Bill Barber
Gravois Mills, MO
On May 3, 2010, at 3:59 AM, CBQ@yahoogroups.com wrote:
> GP (and SD) Headlight Operation Question
> Posted by: "Rick Keil" rkeil6721@hotmail.com redgrey62
> Sun May 2, 2010 4:43 pm (PDT)
>
>
>
>
> I'm finally gathering the parts needed to detail a couple of Atlas
> GP7s. As I get the proper lights, I pondered a question on their
> operation. I believe the lower two lights are the actual headlights
> and the upper two are a Mars light and the emergency (?) lights. I
> usually associate a Mars light with the gyrating light on the E and
> F units. When was the Mars light on the GPs or SDs used and how did
> it appear, steady, flashing, gyrating?
>
> Thanks
>
> Ricky Keil
>
> Bellevue, NE
[Non-text portions of this message have been removed]
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