Thanks - I have done the same - take apart and put back together - my other HO set had no issues with the EZ track but the train is a little larger than the tiny DeWitt Clinton (had to buy it as I saw the replica at the Henry Ford Museum). If the piece of track is defective I think they should replace it, no?

I will connect the track again over the weekend and take a pic of the segments that have an issue. I believe I had it all lined up ok and not over or under anything. It is apart now but I'll get the track together and post a pic. Thanks.

I have the De Witt Clinton (tiny!) HO model train and when I connected all of the EZ track a couple of them did not align so the rail on one piece was higher than on the connecting piece. The little train can't handle it and uncouples the cars or derails.  I have switched them all around to see if some fit better with others but still there are 2 that have this little difference in level. If you run your fingers over them it is not smooth.  I am afraid to bend anything. I have another HO set and had no trouble with it. Is the track section defective? What can I do?