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Thanks for your responses. I have purchased an NMRA N scale track guage a couple weeks ago and I have check both the guage on my engines and my track. So far here is a count of my engines and which ones work and don't. Working Engines Kato RDC #1 in guage Kato RDC #3 in guage Kato SD90 (UP) slightly narrow in guage Lifelike GP-20 slightly narrow in guage Engines that derail Kato SD40 (CP) in guage Kato SD40 (CP) in guage Kato SD90 (CP) in guage Kato SD90 (CP) in guage Kato SD90 (CP) in guage A slightly narrow guage by my definition is a wheel set where one flange sits into the notch and the other flange is almost in the notch but slightly closer to the center. I believe the reason why the one SD90 works is because the guage is slightly narrow and makes it around the corners without any derailments. Now I have checked those 11" corners where my engines derail and the track guage is slightly narrow. So my current plan is to rip up those corners and relay new flex track. However I may relay those corners slightly differently. My current theory is when those 11" corners dried after applying the 50/50 glue mixture the flex rail glued preventing any flexibility. I have found when the flex track is loose the track will slide side to side slightly. Now I believe since the flex track was laid with the loose rail on the inside of the track it naturally pushes towards the center of the rails; therefore, narrowing the flex track. However, if I were to lay the flex track with the loose rail on the outside the loose rail will pu***owards the outside slightly. I'm making a test track tonight where I'm going to glue down a piece of flex track with the loose rail towards the outside. Then I'm just going to run my engines over it and check the guage after it dries. And to answer your other questions: I currently don't have ballast over the areas where my track is laid down. I don't plan on using Kato Unitrack for my layout. I like the idea about the Micro Eng. Flex track and I agree that it is easier to use but I believe there has to be a solution to this problem as all my track has been laid. I thank you all for your responses and I'll keep you informed how my track experiment goes tonight. Until then any further suggestions, ideas, or tips would be greatly appreciated. Thanks, Paul
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