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I just finished laying my track a couple of weeks ago and thoroughly tested it with all my engines (GP-20, SD40, SD90, and RDC). The SD40 from Kato was the most helpful as it pointed out joints that required fixing as the guage was slightly too narrow. After all the repairs were done no more derailments were seen and all the locomotives were tested for over an hour running different directions through all the switches. However after gluing the track with a 50/50 glue to water mixture (used 60/40 rubbing alcohol to water with a dab of soap prior to application) the SD40 now derails in several sections. I can only assume when the glued dried the loose rail in the flex track dried and narrowed the track slightly as it was on the inside corner. The smallest corner is an 11" radius and the Kato locomotives are guaranteed to the 9 3/4" radius. I've just purchased 3 more SD90s and they all have the same problem as the SD40 whereas my first SD90 didn't. The only similarity between the SD90s just purchased and my two SD40s are the wheels. The wheels on my other SD90 that works fine have slack between the flanges and the rails when you shift the trucks side to side between the rails. However there is very little slack on the two SD40s and the other 3 SD90s when shifting the trucks side to side on the rails. I'm also using Atlas code 80 flex track. Would laying the flex track with the loose rail on the outside prevent this problem? I've been told I could use a pocket stone agains the inside curve rail to enlarge the guage so the trains won't derail. I've also been told how to re-guage the wheelsets on all my Kato engines so that they will have more slack like the other SD90 engine from Kato that works. Has anyone ever had this problem before and if so what was there solution. Thanks Paul
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