I received the new Lionel 2-6-0 Milwaukee Road engine last night from Mr. Muffin. Everything works perfectly, except that the lead/front drive wheel derails at the frog. The pilot wheels go through just fine. I have never had this happen before - all my engines and all my Ross switches have worked flawlessly in the past - and am not sure how to correct it. I'd be grateful for any suggestions.
Thanks in advance,