Pygmania

There's a good chance you saw this on Gothamist, but I wanted to put it here anyway for like Posterity 'n' Stuff, Inc. History of the New York City Subway system: an animated GIF starts with a blank subway map and draws each line in the sequence in which it was built. [source: very-appealing.com ]

What follows is an impressive catalog of departure sounds and next-station announcements of subway systems around the world.  Courtesy: mic-ro.com/metro/table.html © 2004-2015 metrobits.org Amsterdam An electronic "ding-dong" signal. There is also a "ding" and in a pre-recorded voice the next station name. At the terminus, the voice says "Endpunt". Ankara "Booop! Ding-dang" sound when the doors close. Athens There is a series of beeps that starts when the doors start closing and stops when they are closed. Then when a train reaches the next station there is a ding-dong and a station announcement in both Greek and English (English added for the 2004 Olympics). Lines 2 and 3: There is a continuous beep when the doors start closing until they are closed. Atlanta The MARTA subway in Atlanta has a 1 kHz beep going off four times on the newer trains, like: "boop-BOOP-BOOP-BOOP". The old trains have a loud "PONG".