If you mean to power the track and the TIU with the CW80, then no, that's not a good device to use. MTH engines won't like the power from that device. A Lionel PH series brick is a better choice for power. Like the PH180 for example. Of course, the MTH bricks are also good choices for this as well as the Z4000. There are many choices as long as the power is not chopped like that from the CW80.
If you mean just to power the TIU by the Aux input, then I don't have any experience with using that. I would recommend about a 1 amp 12 volt power supply for the Aux power of the TIU.