Thrown into space

I was talking to a friend last evening... mentioning about why nobody does this.

Today satellite launching involve expensive rockets and unpredictable technology. Rocket science has not much of improvement since we first fly to the moon. Now that we have superconductivity train couldn't we do something better?

My idea is ..if relativity theory is in place why not build a circular super conductor high way loop. Then run another super conductor loop inside the existing loop and so on.
If the object inside the loop is traveling in 300km/hr, if it is in the the 4th loop. then it's speed can easily be 1200km/hr when view from outside.

At a certain velocity all the loop will syncronise to open up a hole the object will then be thrown up say at a speed of 1200km/hr.

The good thing for the entire track/loop are reusable. The fuel is the electricity, and since less thruster is needed to bring the object to space, the payload is lesser.
This could be a viable solution for space travel in the near future I believe, rather then using thrusters and rockets.