Nostalgia for the Northern line

London Underground Tube Diary - Going Underground's Blog: "Delays on the Northern Line...... Because one of our staff is missing If I'm late for work this morning it's because there were delays on the Northern Line this morning due to a missing member of staff. Staff were searching for a 'lost' colleague at Clapham South station today, (which for some reason caused disruption to the whole line) and in the end it turned out that he'd simply failed to clock in for work! Only on the Northern Line!" Yes indeed, makes me feel quite nostalgic. The previous entry on the London Underground blog is a shot of a sign at Penrith station (in Cumbria). It says "Keep back from the platform edge. Or you might get sucked off." See link for other similar pictures.