@mike g.: 
Your right, I didn't notice that detail in the picture. What happens is that where possible, I turn the trucks on my shelf display cars inward to give me a little more space on the shelf. I forgot to turn them around for the picture ! By the way, they are standard Lionel knuckle couplers in plastic.
Don
Don, now that you said that I went back and looked and can see them plain as day! What a great idea, I just might have to try that to get a little more room!
