This picture is not at all suitable for TB (Train Board) Pic. A prefect TB pic should contain the visible train board.
This pic may be considered as a Loco Pic, since the loco is still visible. Although I would suggest not to go for this one, as the Loco Number seems to be very hazy in this particular case. Try in another better picture.
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In order to update a Loco Pic, you must use the "Add Tag" button (under "Actions") to tag the Loco first in the blog. Then using "Actions" button, you can update it.