Try running the train in the other direction. I had the same problem. When I ran the train clockwise it would derail. I changed it to run counter clockwise and it never derails. Good luck. It has to be the way it comes through the switch. 

Thanks everyone for your response. I will try to buy an older crossing and use that for repairs. If not maybe I can reproduce the part.

Can anybody tell me if you can get replacement parts for an ez track crossing? I need the piece that lays between the rails that as the train rolls over activates the crossing gates. Thanks for your help.

Being new to railroading I have a question for the experts. I have a lot of older engines and cars that need couplings replaced. Can you still buy the older style or do I need to upgrade to a newer style? What part # would I need for the older style and what suggestions to go to a newer style. The easier the better. Thanks for your time.

Thanks for all your help. I will give it a try.

Can I power 12v led's with 9v- I like to use 9v batts and a toggle sw to light my buildings so I do not have to drill holes in my layout. I like to move stuff around on my layout and this way I do not end up with holes all over.Togle sw on the side of the building and batt pack inside building.