The diagram below illustrates how to wire any Tomy AFX 2-lane race track to use individually powered lanes. This method will effectively double the power available to each car, and eliminate the power surge problems associated with a single power supply.

Simply insert a second Tomy AFX power terminal track into the layout with the connection block exiting from the same side of the track as the first one. Then connect one power pack and one hand control to each power terminal track. Each hand control needs to be connected to the corresponding lane it will regulate.
The diagram above shows two power terminal tracks placed next to one another for simplicity, but they can actually be placed anywhere around the raceway to allow the two drivers stations to be located at different points around a larger table.
From Greg Braun