CornerstoneWalthers SceneMaster HO Scale Model Double-Track Railroad Bridge Concrete Abutment 2 Pack

Q: Does it have its own power supply?

No - it is powered by your accessory power supply (transformer or other 12V source). Generally, it is not powered by the track. The power needs to be a constant 12V not the variable connection used to power locos. DCC provieds too much voltage (~16V).

Q: Top of page next to picture says its 23" long, but the product information says its 18". which is it?

23" a got 3 of them to make one long bridge

Q: Does it come with track or a certain code of track I have to use. And is it loud, also how hard is it to wire the tracks to the turntable?

It does not come with track and you can use any code track with it, have not hooked up yet because of a fare in home, but tried it out and will use a smaller train controller to have it run, just a idea. good luck

Q: I ues traditional control will my trains run on the table? or will I have to push them off the table and back onto new wired track?

If you mean by "traditional control" you are using DC, you should have no problem with running your locomotives on to and off the round table on their own power. The turntable comes with wiring so that you can power the track on the table. It is a pretty simple installation. You will have to run the table lines to a power source and also the tracks leading to the table and tracks leading off the table say into a round house. One thing to consider is that you should have a way to reverse the polarity of the table's power to match the tracks you are leaving or entering. Hope this helps, Lou