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HI There My name is Larry in response to your question one of the first things you need to look at is the gauge of the wheels on all locomotives and rolling stock this is done with an NMRA GAUGE for the scale you model in if you do not already have one i suggest you get one it is a very valuable tool to have it tells you wheel gauge track , points and flanges so you can see if everything checks out if not you can easily fix it if the problem persists i usally run the train reeaal slow through problem area and use a flashlight at track level to see exactly what is occuring at that point to cause the derailment i.e wide track narrow gauge point pickin, low coupler pins debris inside rails where the wheel ride or even misaligned track joints even the slightest bit can cause it to bail out i would start there as far as flex track i do not know as i do not use myself my layout is made with Kato Unitrack all 12 by 15 feet of it i hope this helps ya LARRY FLAGSTAFF AZ
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