Chuck,
In N scale, you are on your own. With the exception of Kato which makes lighting kits for their passenger cars, and the odd Rivarossi light kit you can find on ebay for their heavy-weight cars from the 70's, there is nothing specific out there right now. Some manufacturers are making after market light kits for cabooses. I do not know the names.
As for passenger cars, get yourself some phosphor bronze from Walthers, cut a set of wheel wipers and use a 16 volt bulb inside the car to light it. Hopefully the wheel sets are metal with metal axles and one sided insulated wheels.
Do you have a Walthers catalog? If not, go to
www.walthers.com for the on-line catalog. you can find a lot of stuff there.
My "Backshop" can light your cars for a nominal fee if you care to have me do it. It's not difficult Chuck. Even if I did one for you, you could then copy it. I'm not really trying to drum up business, I have enough to do, but I just fixed Blane's Berkshire and it runs great. I'll wait until he gets it back before I blow my horn.
You newer guys just have to experiment more, that's all.
B-)