if the red light is lit on power up on the z4000 then you either have a short or transformer issue ! I would disconnect your transformer from track and then power up and see if shorts clears. if is does it is either a track problem or short in your engine! if the train starts as soon as you power it up the tiu is not sending out the watch dog so engine will stay silent! sounds like your having a tiu problem does your tiu find the remote and if so do you have the DCS turned on go into dcs setup and set aon which will turn all channels of dcs on! aon means all on for dcs!
let us know what you find out. !
Alan