[PRR-talk] Marker/Classification Lights

[ARRJERRY at aol.com]

Happy New Year,
I am looking for some expertise on Marker/Clasification Lights. I can't seem 
to find a good source to reduce my confusion.
I am building a 1.5" scale NW2 #9175. This Loco had front and rear 
"tombstone" Markers. I was able to purchase some drawings of this Marker thru the 
Society. They were used on the front of several steam locomotives - mainly J1's.
1. Do Markers and Classification lights serve the same function?
2. Why would you need Markers on the front of a locomotive as opposed to rear 
markers on a train?
3. The elliptical lens seems to hold two (upper and lower) bulbs. Why?
4. Is it logical to assume that this one of a kind NW2 received these 
"markers" as classification lights?
5. I have seen factory painted PRR brass with red, green, and white 
classification (marker?)  lights. Can someone clear up the color rules for me?
Thank you for any info you can provide,
Jerry Schoenberg


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