Image:Thirdrail.SouthStation.agr.jpg

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Third rail at the South Station stop on the Boston subway's Red Line. While the third rail shown here may look old and grungy, it is actually advanced mass transit technology. Third rail is subject to heavy wear and must be made out a strong material, typically steel. Unfortunately, steel is a relatively poor electrical conductor. A new method for reducing the resulting resistive losses is to attach strips of aluminum (which is a better conductor of electricity) to the steel third rail. Since aluminum has a different coefficient of thermal expansion from steel, the strips must be applied on both sides and riveted at frequent intervals. The third rail pictured here uses this method.


I took this photograph on October 6, 2002. A potentially copyrighted billboard was edited out and new text substituted.


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--agr 19:30, 6 Sep 2004 (UTC)

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Camera manufacturer FUJIFILM
Camera model FinePix1400Zoom
Orientation Normal
Horizontal resolution 72 dpi
Vertical resolution 72 dpi
Software used Adobe Photoshop Elements 2.0
File change date and time 15:05, 6 September 2004
Y and C positioning 2
F-number f/3.6
Exposure Program Normal program
ISO speed rating 125
Exif version 2.1
Date and time of data generation 16:22, 6 October 2002
Date and time of digitizing 16:22, 6 October 2002
Image compression mode 4
Shutter speed 1
Aperture 3.7
Exposure bias 0
Maximum land aperture 3.7
Metering mode Pattern
Flash 0
Lens focal length 8.6 mm
Color space sRGB
Focal plane X resolution 2453
Focal plane Y resolution 2453
Focal plane resolution unit 3
Sensing method One-chip color area sensor
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