He said LU "were getting into the spirit of things by decking the place out in balloons and having some staff dressed in period costume handing out centenary choclate coins to the customers - it was really sweet and I saw loads of people with a smile as they entered the depths of the Northern Line - itself a rare sight!
I grabbed a pic of two of the supervisors in their finery". And very nice cheerful looking chappies they are. Thanks to Gareth for sending them in. Did you see celebrations at any of the other stations?
It looks as though there were some older trains put on from the terminal at Mill Hill East, although this wasn't mentioned on the TfL's site (however, a new station called Morning Crescent did seem to be celebrating!).
When the line was extended northwards and southward in the mid 1920's it became known as the Morden–Edgware Line, although a number of alternative names were suggested such as “Edgmorden” and “Medgware”. Unfortunately neither were taken up and the Line was eventually named the Northern Line in 1937.
It's sad there's only the Bakerloo line that has this amalgamation of names. Personally, I wish the Piccadilly line was called the Cockerdilly line.