I have a ZW-L and like it very much. It has some great safety features. While it does have built in Powermasters and you can address them with either a CAB1, CAB1-L or Legacy 990 systems there are some down sides to their functionality.
One: The built in Powermasters select the track or engine programming. For instance if you program them for Track 1 the ZW-L automatically assigns Track numbers 1 thru 4 to the corresponding handles.
Outside left is Track #1, inside left is #2, inside right is #3 and outside right is #4. It does not give you the option to change which handle is which track number. This goes for programming the ZW-L as an engine.
Two: With the Track Power Controllers the operator chooses which track or engine is assigned to the TPC. The TPC’s unlike some of the other controllers, ASC for instance, do not automatically assign any track or engine numbers.
TPC’s especially the 300 or 400 series also allow better control when used in the command environment. You do not need to dial up the voltage if it is set on command and full voltage. You just use a single command. They also allow better control of MTH engines in the conventional mode but this is moot since the OP has the DCS system.
All in all the ZW-L’s are great transformers but they do have some functionality shortcomings.
Lastly, since the OP already has the TPC’s why not use them.
I do agree with the other responses that one and certainly two ZW-L’s would provide more than enough power to every aspect of this layout.
Having said that, I would suggest the OP just install one ZW-L and if the power is not sufficient either install the two Z4000’s or purchase and install an additional ZW-L then sell off the Z4000’s to offset the expense of the ZW-L’s.
