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Dimmed Fluorescent in an old Tram (streetcar)

Dimmed Fluorescent in an old Tram (streetcar)

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The Prague "Nostalgic" tram line No. 23 uses original T3 tramcars (manufactured since 1962). I can remember these with round incandescent ceiling fixtures when I was a little kid in the late 1970's, maybe even in early 1980's. This is a bit modernised version with fluorescent fittings.
The tram drivers used to dim the lights near their cabin to avoid reflections in their windshield. Here they used blue paper. The round incandescent fitting were often dimmed by hand painting with a green, blue or possibly also red colour paint.
(Sorry for the low quality shot.)

IMGP5127.jpg lozisko.jpg dimmed.jpg grymk1.jpg

Light Information

Light Information

Model Reference:T3 tramcar inside
Lamp
Lamp Type:linear fluorescent
Electrical
Voltage:DC powered, ???

File information

File information

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Filename:dimmed.jpg
Album name:merc / Off Topic
Keywords:Off-Topic
File Size:31 KB
Date added:Jun 24, 2018
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trojmiejski
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Sep 22, 2018 at 06:06 PM Author: trojmiejski
From what I know incandescent fixtures were used in Tatra T1 and T2 trams while Tatra T3 had fluorescent lighting from beginning (except later T3D version exported to Germany which had incandescent lighting as Germans specifically requested such lighting). Design of circuit powering the tubes is quite interesting, they are powered by 600V DC from catenary through a special resistor. As tubes on DC exhibit mercury migration, driver can switch the polarity using a lever in his cabin at the end of a route.
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