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Bill,
Thanks for the info. While it doesn't
confirm what I think may have happened, your time frame of the
late 50's does coincide with the red repainting. Perhaps that is
the event that led to re-lighting the units at the same time.
Lyle Dowell
On 9/7/2019 9:50 AM, William Barber
wrote:
Lyle,
There is an ICC/FRA regulation concerning the amount of illumination that a headlight provides. It has to do with distance and lumens, something like a certain amount of lumens at a certain distance from the front of the locomotive, as I recall. There was something about illuminating a person standing 400 ft. In front of the locomotive. I don’t know when that regulation was established. The dual seal beam headlights provided more illumination than a single incandescent bulb. EMD Engineers were always concerned with meeting the regulation whenever designs were changed. They had reservations about whether the primary headlight mounted on the short hood met the regulation, but a number of RR specified that arrangement, including the Q. Other factors that may have led to the change was the availability of the older bulbs as the seal beam headlights became more common and reduction of their replacement parts inventory. By the late 1950s, all the Q’s GP, SD, later E and switcher model locomotives were delivered with seal beam headlights. I am sure that companies like Pyle-National, recognized the situation as technology was changing and developed a direct replacement kit for older locomotives with incandescent headlights. Even some steam locomotives on other RRs were equipped with dual seal beam headlights, and I think that the Mars lights on Q steam locomotives may have used the same bulb.
Bill Barber
Gravois Mills, MO
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