These HO brass log cars are great collectibles. To use them, you can place them on your model train track. Since the couplers and trucks are not included, you'll need to get the appropriate ones separately and attach them. When handling, be gentle as they're fragile. For maintenance, use a soft cloth to clean the surface and remove any light dust. To prevent further tarnish, store them in a dry place. If you need to replace the spare parts, use the included ones carefully. And remember, if you're not satisfied with your purchase, you can return it within 30 days for a full refund, just pay for the return shipping unless the item arrived damaged.