How will they re-boost the orbit always fleeing from space station after the shuttle is gone?

Coddoo Question : How are they going to re-boost the orbit always fleeing from space rank after the shuttle is gone
I know that budget cuts canceled the “space tug” that would be reviewed regularly scheduled boost the Space Rank, so they relied on the space shuttle to give him a small push from time to time to keep over space debris in orbit. I hope they have not forgotten to provide a method for reboost when there is more space shuttle launches to exact the function. Preeminent answer:

Response Martin
Space Shuttle has been used only occasionally for convenience. The rank can also be stimulated by its own rocket module on board, or one of the ferries docked Soyuz. Using the shuttle was to save the module in rocket propellant.

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