Offered today are these very nice American Flyer S Gauge 1950's Operating Knuckle Coupler Trucks.If you need these freight car trucks you will find it hard to find a better ones They have tight side frames and the couplers operate as intended. These are the small hole version but the correct size drill can make than large hole in about a minute.They are offered at $9.95 per pair. Buyer to pay $4.50 for Fast Shipping.Each additional set ships for $.25 extra.