A while back I got my first bachmann ho train set
The pacific flyer
Later I aquired the Chattanooga and echo valley sets and I soon noticed that the couplers are loosing their strength
For example if I couple the boxcar and gondola of the flyer set together they WILL NOT stay together
I noticed that the black plastic curve piece (don't know the actual name for it) always is positioned to the side
Can someone please give me some insight about what to do perhaps maintenance