Thunderbolt:
http://www.aceonline.org/census/PhotoDetail.aspx?ID=741
Blue Streak:
The mars lite is a cone with the headlight in the center. While it's lit The light makes a figure eight motion within the cone meaning the beam does a figure eight.
These type lights were used on Southern Pacific Steam locomotives. It was believe that along with the headlights. The moving light made the locomotive more visible to motorist. Back in the late 80's trains had nothing but the headlight. Adding Ditch lights did the same thing as the Mars light in making the locomotive more visible. They are now required by law.
Anyhow, Do a search on Camdens Big Dipper and Souther Pacific Daylight Locomotive http://www.sp4449.com/trips/05holiday/index.html
I was very fortunate to ride Kennywood's Thunderbolt at night with the the headlights working, including the oscillating Mars light in 1998. Very strange visuals both while on the ride and watching the coaster trains from the midway. It's just too bad that neither Conneaut nor Kennywood use their's anymore. Does the Mars light still operate on Camden's Big Dipper?
I don't know if the headlights are functional anymore or not either.
I don't know how long NAD actually marketed the lighted trains. Most of the NAD trains I've seen either in person or in pictures appear to have at least the appearance of lights or of the covered lighting fixtures.
Here's the best pic I've seen of the front of a Century Flyer with the lights!
http://www.ridezone.com/parks/pa/conneautlake/conneaut02.htm
Bear in mind that NAD also was very big into park trains at the same time they were building the coaster trains. I believe the Mars light may have been a carryover from their association with railroading. (If you don't believe me, compare a picture of an NAD park train and NAD coaster train....)
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