Davidos NR Class questons. NSW steel rollingstock?

Road Number Issue.
When I add in one of Davidos NR classes into a layout say when it appears it has the number NR20. Whenever I try to change the number it disappears. For example, if I try to change 20 to 30 it goes from being NR20 to just NR. Why does this happen and how can I fix it?

NR Class Cab Queston.
At the moment I don't really mind about the NR class cab but I was wondering if there is a cab on the DLS that is similar to the NR Class cabs. Like the cab currently, the controls are on the wrong side.

NSW Steel Rollingstock
What is the rolling stock found in this video called.
http://m.youtube.com/index?&desktop_uri=%2F

NR Class Livery Queston
Is there a reskin avalible that is a NR in I think sea train livery and steel link livery.
The liveries found in these photos.
https://www.google.com.au/search?um=1&client=safari&hl=en&biw=1024&bih=672&tbm=isch&sa=1&ei=8Xu9UfP4BceskgWv-IGYAQ&q=NR+class+steel+link&oq=NR+class+steel+link&gs_l=img.3...8175.8175.0.8658.1.1.0.0.0.0.313.313.3-1.1.0...0.0...1c.1.17.img.Yhqr2Dg-aTo#biv=i%7C1%3Bd%7CmYxXo2H8Je-LPM%3A

https://www.google.com.au/search?um....17.img.x_Y_hyjngbc#biv=i|5;d|S8nEk1HjOqjlEM:

-Eno

Eno if you click the little ? Symbol in Surveyor with Davidos locos you should be able to change the liverys, I know nearly all the new and older schemes are there for sure mate. No NR Cabs available as far as i know so far.
Not sure if you know of Davidos Site http://home.exetel.com.au/cws/worrybrook/ But most of the Newer NR Schemes are there.
Mick.