Old Tech Knowledge needed for confirmation…

YO
I transported my Xmas gift from my brother in back pack from CO to TX
Wrapped up with 2 sweatshirts
They survived…..

 

My Question

unknown if these are traffic lights
Mainly bc of the blue lens

me/dad/brother arguing/discussing
If for auto light or RxR light
Love to here opinions/facts
Cheers

happy turkey day all!!!

 

R.R or traffic sound about right.?
Put a yellow lamp behind a blue lens and.....

Found this..
https://www.koppglass.com/about

 

I’m finding reasons for both
-blue light for RxR means workers present
-yellow incandescent bulbs ‘could/would’ make blue lens glow green

???????

 

Airport?

 

Hmmmm^^^^^
Crap
That makes a 3rd choice/answer

 

Due to their size my guess is R.R.

 

I would bet railroad.

 

@BartMaster1234

 

I have a 3M traffic signal in my garage, the green light lens is clear. Traffic signals usually have clear lenses (with a green bulb or LED) so that sunlight shining directly into it won't deceive drivers into thinking it's a green signal.

 

Found model/part# on blue lens

 

btw
That yellow surround/shade is mine
(I picked up on side of rd after last hurricane)
Kinda same diameter but is plastic

 

It's probably for a traffic signal. I've seen green/blue-ish lenses on obsolete traffic signals.

 

^^^ding ding ding

this from Kopp glass site:

 

Thanks BartM!

soooo
The guess that the bulb color makes the blue glass shines green?

that I can’t confirm but appears to be only answer