Around Christmas of last year I purchased a MTH Norfolk Southern A-B-A set. Each unit was sold separately and the 3 units purchased included a F-7 A powered Unit Diesel Engine (#20-20556 -1), F-7 B non powered Unit Diesel (#20-20557-3), and a F-7 A non powered Diesel Engine (#20-20557-4). At the time I decided to go with the non powered F-7 A unit because I use the DCS wi-fi app and at the time you could not perform a lashup using just the app and I didn't want to be jumping back and forth between my phone and the hand held remote. Plus the price was right. The A-B-A set has been running great since the purchase. About two weeks ago I decided to purchase a second non powered F -7 B unit to go with the set(#20-20556-3). As soon as I added the second non powered B unit to the set the engine had a very difficult time getting up to speed and would come to a complete stop when traveling around the corners. The engine was running the entire time but seemed to get stuck. The train is currently running on an oval track that has O - 72 curves. I am assuming that the problem has to do with the combined weight of the 3 non - powered units that the one engine is trying to pull. Is there any fixes to the problem other than purchasing a second powered A unit and setting up a lashup. I realize with the new premium app that has been put out that lashup can know be performed. Thanks for your time.
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