Tony P says:

Hi KC, To run on any reversing loop you have to segregate power to the track section and energize it and control power to each segregation and shut power off as the loco passes thru that section of track, so it doesnt short out. It sound hard but once you do this it is relatively simple. Check Roberts book on this or you can get an atlas layout book that also goes into great detail on reversing loops. Now as for the 2 different tracks (copper and nickel) as long as you have the same code, ex: 55, 80 etc, you should have no problems. Take a sample of both and match them up, if they fit perfectly you are good to go. BUT I would only join them at the least amount of points as I possibly could and then remain with the nickel silver for the rest of the layout. If there is an obvious difference in look I would make the transition in a tunnel or overpass or what ever. What gage are you modeling in? Remember the different codes have different heights even though in the same gage. Make sure where the different tracks join that they are exactly in line and height so as to avoid derailments and poor electrical connections. Maintenence may be a little more on the copper but if that dont bother you, you are good to go. If that is a problem then before you start save your self a lot of time and head aches and cut your losses (which are none since your friend gave them to you) and buy all new track. If you can understand my next statment “I can not afford to go cheap”. I am by far not rich and I have to make every move count, so If I cant afford it right now I wait and get what I need or want as the money becomes available. Remember this is suppose to be fun and you will run into enough problems along the way with out adding to them. But if all matches up and you are happy with the final product “keep on railing”. Tony P