This Z8: Extra-Large Oval w/ Holding Track is 84 in length and 34" in wide. It was designed to be run in DC. Here are several important features:
Because  it uses the most gentle curve (270 mm) commercially available, it  can run trains that are as long as 14 cars in length.
And this layout, even though it has but a single track, can support two trains at a time  because it has a long holding track where you can park one of the trains, either just to store it or to let the other train pass it by.
 
     We won't try to cover all the details about this layout IN WORDS when, in fact, we have created several videos that can tell the story much better. Click on the hyperlinks as follows:
 
1. SHIPPING "STACKABLE" LAYOUTS" - How we stack and ship layouts this big -- and which you hook up at your place just by inserting the adjustable tracks between sections.
 
2.  HOW TRAINS CAN SHARE  A TRACK --EVEN IN DC (something that is possible once you have the right holding track technology in place).

3. BALANCING THE SPEED OF TWO TRAINS --  if you want two trains to share a track, you must get them at least somewhat close in speed.
 
     As for shipping the layout, you will get it in TWO SECTIONS. We will provide complete instructions, including how you will glue up the  TWO LAYERS of 1" thick foam that we ship (so that the whole thing becomes a single 2" thick 'monolith' of material). Then you will use the adjustable tracks we send to hook the sections together. If you haven't already watched the video that was listed above on  SHIPPING "STACKABLE" LAYOUTS" we highly recommend you do so now.
 
      If you would like,  you can download a full-page track plan or the electrical diagram: for the track plan, click here: TRACK PLAN PDF -- for for the Wiring Diagram/Instructions , click ELECTRICAL DIAGRAM. .
 
WE WOULD ALSO RECOMMEND YOU CHECK OUT THE Z9 AND Z10 LAYOUTS -- they take this basic Z8 design AND INSERT OTHER LAYOUTS ON TOP OF IT. 
 
 A couple of closing notes: The price listed includes the track, the turnouts and bumpers, and the glued-down scenery (which includes hand-ballasted track). Turnouts for holding tracks are powered but turnouts for sidings are manually operated, and while we provide all power feeds and cables needed, we do not include power controllers for track and turnouts  -- nor  do we include any buildings, locomotives, or train cars. 
 
I close with a personal note from BILL BEIN of LoganSquareZandN: "I HATE powered turnouts from both Kato (N) and Rokuhan (Z), and I personally operate all mine manually -- even if I must first stop trains and then turn them back on. I can promise the Holding Track turnouts  DID work when installed -- but I make no promise beyond that. In addition, we personally have had so many derailments when backing Z-Scale trains through turnouts that we prefer to have all sidings be NON-POWERED, and that is how we would wire the layout for you UNLESS YOU GIVE US SPECIAL INSTRUCTIONS. Please feel free to call or email us if you wish to discuss this.
 
 In closing, have you seen our YOU TUBE video on our Logan Square Z and N SHOWROOM – where we have 12 trains running on 9 layouts – all at the same time? Here is the link to see it: YOU TUBE VIDEO