B&W with only one colored detail

Challenge #28 in the variable subjects I series. Hosted by Lext123.
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Convert your color picture to Black and White,... except for one object or detail.
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Warsaw Tram
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A tram in Warsaw with the Palace of Culture in the background.
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Submitted: Wednesday, 21st March, 2012 05:26 (GMT)
Taken: Sunday, 11th March, 2012
Focal length: 24 mm
Shutter speed: 1/1000 sec
Aperture: F4
ISO: 100
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