Gamera
Hello & Welcome to the Forum!

It's wonderful to inherit pre-loved trains, usually a little lubrication (i'm using mobil 1 synthetic these days), some spit and polish to make 'em look purty, give them some power and get into the "O" zone listening to the clickety-clack as they go round- round.

To add to Train Larrys' reply;
If you haven't yet, check out our Lionel Maintenance & Repair sub forum, a lot of good information there.

If you can't find a lockon or are jones-ing to run your trains, you can solder leads from the center rail and one from an outer rail to hook up to your transformer. if you don't have a soldering iron, you can jam the wire into the connection points on the rails, not estheticly pleasing, but it works in a pinch. If you know anyone that runs O trains, they might have an extra lockon they'll pass on to you.

Hope this helps, and if you have any more questions, please ask.

Happy Rails!
dave