The challenge with shooting the DC Metro is removing the rather ugly green color cast that most photos end up with. After some white balance, levels and saturation changes in Photoshop and color adjustments in Color Efex I was able to clean it up so that it accurately reproduces the true tones of the station.
This one is a manual blending of two exposures, 0ev and +1ev through layer masks.
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As always, thank you for looking!