Hi All!! This is Tomity from Tokyo Japan
I tell you about information of Japanese Velodromes
There are two kinds of velodromes for amature race and for Keirin
race(Municipally operated races) in Japan
There is velodromes of 70 ground in Japan
As for the velodromes inside for amature, there is 23 ground
The rest of 47 scene is velodromes for a municipally operated race
I posted Bike Forums
http://www.bikeforums.net/showthread.php?t=458452 You can see the aerophotograph of velodrome with Google map.
I don't understand the building year of all velodrome
I examined the location and a lap length