Using this locomotive set is easy. First, make sure your layout is set up, whether it's an Analog - DC or DCC layout. You can then place the locomotives on the tracks and power them up. The working headlights and Mars Lights on the A Unit will add a great visual touch. When it comes to maintenance, check the wheels regularly as they may have moderate wear over time. You can clean them gently to ensure smooth operation. If you need to replace any parts, the spare parts included will come in handy. Store the locomotives in the original boxes with the foam inserts to protect them. When shipping, we've packed them carefully, but handle with care when you receive them. If you're not satisfied with your purchase, let us know within 30 days for a full refund, just be aware you'll be responsible for return shipping unless the item arrives damaged.