Well shoot...Reason I was asking about passive mode is for the battery powered installs in large scale. Right now I have to strip & stuff a TIU & WIU into say a boxcar or baggage car. The Explorer would have been great for these installs but a 4 amp continuous load rating limit is kinda discerning.
The guys that I deal with have some huge outdoor layouts that in no way can be track powered as we're talking 1,000's of feet of aluminum track...Battery power is the norm.