Thanks. We tried running some Athearn streamlined passenger cars and it most often than not, we are encountering derails on random parts of the tracks. On the contrary, when we run hoppers, box cars, or any shorter load, we don't encounter much issues with derailing... could the issue be with the truck mounted horn couplers, the 18r curves? Or the wheels itself? The kids really wanted to run the passenger cars and gets disappointed everytime it causes problems...
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