It looks like most of the questions were answered over the weekend. In regards to running these cars remember the 3-rail versions have the Atlas patented Adjust-A-Coupler system that allows the cars to run on 072 diameter curves. You can read more about the Atlas coupler system here: http://www.atlaso.com/adjustacoupler.htm
I would ask many of you to think outside the home or apartment and image doing modular. Even if you have a home layout you could still do modular and run what you brung (drag racing term). The layout in the video is modular and is expandable to whatever length you want. At York this layout is 10' x 40' which might even fit some basements, attics or garages. I do modular and did so because the company I retired from could transfer you at a moments notice and you had 90 days to get that move made and to dismantle a traditional layout would've been a major headache.
As a matter of fact go out and buy yourself an issue of the May/June O Scale Trains Magazine that has an excellent article on The Central Ohio O Scale Engineers Modular Layout. This magazine just came out. There is also an excellent article in the June issue of Model Railroader Magazine on N scale modules that can be adapted to O scale that's worth a read and if that isn't enough I'm currently writing a series of articles on building modules with Atlas track in our Golden Spike Club Newsletter that I think many of you would find interesting. Yes you would need to be member to get these articles if anyone was wondering ($30.00 primary membership).
In regards to Southern Pacific Railroad switching cars for the CZ I haven't been able to track that information down from a third party or another source other than here. It would certainly drive the cool factor of the Silver Lady even higher that what it is now. Most of what I've read was that the SP didn't like the idea of the CZ invading their territory and used some skulduggery in buying up WP stock to make it more difficult for the WP to be a participant in this amazing train, but I'll keep looking.
I'd like to thank everyone in advance of Wednesday's deadline for buying this piece or railroad history. The orders have been amazing both from our Dealers as well as for the Golden Spike Club sets!
Jerry Kimble - Atlas Model Railroad Company