If only I could bat -this looks relatively easy.....
http://maps.google.com/maps?f=q&hl=en&geocode=&time=&date=&ttype=&q=Velodrome&sll=18.477838,-69.918188&sspn=178.620149,360&ie=UTF8&ll=48.108112,-1.661934&spn=0.001508,0.005021&t=k&z=18&om=1
Thats an overhead view.
And this page has the inside views.....
http://downtheroad.org/Photo/7MexCityArea/MexicoVelodrome.htm
Just scroll down a little. The field in the middle is empty most of the time. And yes, there is not single velodrome out there for Sim City, so this would be a first......