I don't know if others here do what I have done in the past - get a package containing something train related and actually having to put it aside and not open it because you were too busy. I almost did that today because I didn't really have time to play with my new car but I listened to my little voice and took it out to run on a couple of laps around the test loop. It was a good thing I did because I found out that one of the couplers is defective. So back it goes.
I'm not writing this to slam any particular store or manufacturer or get into a big rant about declining quality, yadda yadda yadda. The reason I am writing this is to encourage you to check out thoroughly your new purchases before having to put them on the shelf and getting back to work. If you don't, you will be far more likely to have to pay for a repair (if it can be repaired) or replacement (if you can even get one) yourself.