Tom, I have Legacy and the LCS on my layout. I do not have any MTH items such as the AIU's and TIU's. For track power I use two ZW-L's. The CAB-2's and iPhones directly control the output voltage of each of the eight channels of the two ZW-L's individually. That allows me to run original Gilbert engines. I know nothing about the MTH system but is seems if the voltage of the power source is directly controlled from the Cab-2 then that voltage should be seen on the track unless the TIU has another output power source.
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