I sent an email to Jon to see what he has to say. May he knows more about it.
John: Cap sounds like a good idea. Don't have any lying around so I'll pick one up first chance I get.
Chuck: The cars alone pull about 2 amps sitting on the track when its at full power. So at 18 volts that's only 36 watts.
So far I have not heard if anyone else has see this which is what I was also curious about.