Union Pacific 844 at Night
From the UP Facebook page posted on August 14, 2012. They used this photo to go along with the description. Photo must have been lifted from my Smugmug site.
The red light in question a lot; On UP #844 was used on high-speed passenger engines and were for use while standing in stations so oncoming passenger trains would not enter the particular track they were occupying. The lights were designed by the Mars Headlight Company and were basically designed for flagging both in station tracks, as mentioned above, and on the mainline. If a train went into emergency the red light, which was a working wigwag by the way, would automatically trip and start working without the engineer having to manually turn it on. Some have never seen the "mars" light on the 844 on...so here.
The mars light can be taken as a "final stop NOW"..or maybe the track it's on doesn't have a working signal or it's on an older track (since we do excursions on older lines and routes sometimes)...but most importantly, don't forget. The engine is from the early 1940's..therefore technology was different and so were rules. We simply are keeping the original engine and making sure the public see's what it was like.