Ok guys, track is down and went with code 100 and the layout looks decent. Left a couple of stops on 2 runs for future additions but here is another problem. I have an '80's model gp 40 diesel and motor wise it works great and in great shape. However, the rubber bands on the drive wheels are worn out and can't seem to find replacements since all the newer engines are different drives and trucks all together. Any suggestions?

As an ex Army recon grunt, I like the way JB thinks

Ok, I really appreciate all the tips and suggestions but one more issue has caught my attention....what is the physical difference between code 100 and code 83? I have a bunch of track here but not sure of the code and without anything to compare it to how do I know which is which? The track I have is in excellent shape so I want to use it and don't want to buy all new since I too have limited income to put in this right now. I too have an understanding wife but that only goes so far.

Thank you very much for your help. 

Ok that was a big help but one more thing, Is NS magnetic? All of the shiny track that I have is magnetic.

I'm getting back into railroading after 30 years and see different types of track. I don't want to use the E-Z track and I have several pieces of regular track but it is different in color. Which is better, nickel-silver or steel and how can you tell the difference? How many styles are there?