Several District Line stations used to have train describers of the sort shown here: that is, a big panel with enamelled signs showing the various destinations and types of train (such as "Non-Stop") and arrows which would light up to point to the signs that applied to the next train. I wanted to photograph these before they were replaced by modern electronic signs.

Click on thumbnail for larger picture. For most, I can provide higher-resolution photos by email, if needed.