Photography: Subway, By Bruce Davidson

Two of New York's Guardian Angels lean back against the graffiti'd doors of a subway carriage.

This image is just one of more than 100 in Bruce Davidson's updated edition of Subway, originally published in 1986. The 2011 collection – which features additional images – is printed from new scans of the American photographer's Kodachrome slides.

Davidson, 78, who began taking photographs at the age of 10, has said: "I wanted to transform the subway from its dark, degrading, and impersonal reality into images that open up our experience again to the colour, sensuality, and vitality of the individual souls that ride it each day."