Metro Melody

Traveling around the Tokyo Metro systems is quite a nightmare and worst if you don't know the language. However, I've noticed that each station has its own melody/jingle when the train departs and leaves. This could be a good way to help people recognize the station or people could notice they've arrived while they are having a nap. Although the melodies might seem the same at first, but a few visits to the same station and you will begin to memorize the tune.

This could work in London as many tube stations or regions have a distinct personality. For example, Leicester Square Station could play some form of Chinese tune as it's the nearest station to China Town. I believe it also adds a bit of fun into the old and boring system. However, sometimes the old should be left untouched, as it won't be the same anymore.

More info at:

http://hisaai-hp.hp.infoseek.co.jp/JREast/Yamanote/Yt_s_eg.html