LU line (with probable central/island platform) running alongside an overhead electrified line (itself with no platform at this station); gardens of houses (some with loft extensions which turn out to be visible in aerial photos) back directly onto NR railway; distinctive shoulders on red-painted pillars; distinctive station tannoy speakers. Need to consider several District Line stations between Bromley-by-Bow and Upminster Bridge and some at the northern end of the Bakerloo. Visible train door suggests District.
Now the fun part. These two sections of line are approximately perpendicular, so it should be possible to use the shadows in the picture as a rough DIY sundial. The picture was taken on 30/1/08 at 11:06 GMT, assuming camera clock to be correctly set to GMT which is the correct local time in January. All stations on the network are close enough to the meridian for us to assume that the sun will be approximately due south at 12 noon GMT. Then the shadows should be pointing just a little to the west of due north at 11:06 GMT. If we look at the orientations of those two bits of line (although the Bakerloo curves a bit), it is pretty clear that the shadows will lie across the platform on this part of the District Line and roughly along the platform on the northern end of the Bakerloo. Looking at the picture, this seems unambiguously a case of cross-platform shadows, so it's District.
Upminster Bridge confirmed by comparison with 2 photos on the Wikipedia page
http://en.wikipedia.org/wiki/Upminster_Bridge_station