Here is a superconductor train I have created some time ago and now I added 10 cameras to this scene, so you can change the camera view while the BGE is running by pressing 0,1,2,3,4,5,6,7,8,9,0 on the keyboard.
Have fun:)
Blogpost:
http://3dartdh.wordpress.com/?attachment_id=1521
https://www.youtube.com/watch?v=clLTdp7HUUk
Good