So I got my new Atlas Dash 8-40b, and I don't have any complaints about it, I will cover that in my other thread. Anyway, I got it running and wanted to pull some cars, what else is it for. Well it came with Accumates, and I have all rapidos. So I converted the engine over to rapido with the supplied coupler just until I can get some MT's or accumates for my rolling stock. So here is my problem. I got it all setup, started pulling some cars, first turn, the car behind the engine jumped the track. OK, must be a fluke. So I get it back on, next turn the engine pulls the front truck of the car off the track:curse: . Yes most of my rolling stock is Bachmann with truck mounted couplers. So I have been doing some reading around here and found people having uncoupling problems with similar setups, but not derailment problems. I want to convert a few of my cars over to one end rapido, and one end knuckle to use as a converter car. But I think the problem lies in the coupler being mounted to the truck, am I right? So I need to know, is there a truck/coupler set I can buy for my rolling stock? Or do I need to convert some of the cars over to body mounted couplers? I can see when the engine goes into the tighter turns that the back end swings way out. I will be going to the local train store tomorrow to buy a solution. SO any help would be greatly appreciated. And for the time being, I am only looking to convert a few cars to be converter cars. All the rest of my money is about to be tied up in lots of track for my expansion. Thanks in advance.