Baby question here: why connect multiple transformers? To get more power on large layouts? multiple engines? What? Effect on DCS signal? I just got a ZW-L; do I need to combine transformers? This thing is a bear.
Wally
Gentlemen,
One further word of note for the men using a single new type transformer that is phased opposite of all your older ZW's and KW's. Find an old style plug adaptor, these old adaptors are usually red in color, they have equal sized adaptor plug blades, plug the newer transformer into the adaptor, mark the adaptor and the plug from the newer Transformer with permanent magic marker, for ident purposes. Then simply turn the adaptor with the new style plug in it, around when you plug it into the wall or multi plug. Your new style transformer is now in phase with your older Transformers, no cord alteration required.
Wally,
When setting up numerous Blocks for DCS using more than one transformer determines how far you can expand your layout. I have numerous Z4K's, old ZW's and KW's all in Phase. The Transformers old or new must be in phase to run using the block engineering. The amount of track you are using usually determines how much power you need thru out your full layout. DCS runs great with 18V, thru out the entire layout, so does Legacy.
PCRR/Dave
Wally,
My layout is not huge but I run conventional, I have three loops (three z-1000 transformers) sharing a ground return. Then I have two transformers (ZW and 1033) for accessories, switches, etc....
They can mount up!
.......And I use four small transformers for my four livingroom lines. (3-1033s & 100w Marx)
Another room, 2 lines, a prewar Z for grades w/blocks (4 throttles), and a KW (1 throttle is track, 1 is lights & turnout coil power for all lines) . The Z and the KW lines also share a 1 track mainline block along a wall. (on Z#4)
All small ones were $20 or less and rightly sized for a 4.5x9. Each has a whistle control and direction lever.(well, not the Marx...but that runs Marx mostly anyhow...no whistles. 1033 #4 is now by itself in a bedroom) I dont know about the new ZWs, but I have more whistles and easier direction change than I would have with a ZW, for about half the cost, maybe a third.
(not knocking, had a ZW presented itself at a low price, I would have gone for the extra wattage; My favorites oldies can be run wide open throttle with a 1033. and two of them, if pulling a really heavy load, may even stall or trip the breaker after about ½hr.
That's right, 4 throttles 100% open, and no 100 smph running....kid proof 
Except when I WANT to go too fast, then I just pluck a few cars off 
