Mth Z 4000 and National Railroad Worx Mahwah, NJ

All I can say is there is a forum member here whose sign on escapes me at the moment.  He offered up a series of videos that were well worth the cost.  He had a layout the same size as yours, multiple levels, multiple locos operating (more than your 6-7), grades etc.  All of it ran nicely with a z4000.  What you did not mention is are the locos modern or post war.  I do know the older locos draw more power and that may be a reason to have extra amps available.

Steve! Working on your track order as we speak! So happy you got your other orders! Anytime you need something you know who to call  

I have a Z4000 I purchased in 2000 that is still in operation with NO issues! They are practically "bulletproof" as the saying goes.

The Z4000 is quite possibly MTH's greatest achievement!

Rich Batista is the forum member. He has produced very nice videos.

No one has ever mentioned this, as far as I know, but I believe the over current protection on variable track outputs of the Z4000 are rivaled by none, Why? Because the Z4000 output is electronically generated and cannot possibly allow the same short circuit currents that a traditional (transformer) power supply like  a Lionel 180 Watt would allow.