Here is a simple motor and circuit board stress test, where you can predict if damage may result, when lashing certain engines in an MU lash-up. In addition to comparing speed differences while running the engines close together (without them being connected), is to make a record of the amps being drawn to the layout, while the engines are following each other around the track. Pay close attention to the reading you get when none of the engines are in a curve. Now create your multiple unit lash-up and run them again while paying close attention to the amp draw when none of the engines are in a curve. If there is a dramatic increase in draw, the engines will be telling you, "hay man, were not very happy working together and one of us is going to get hurt". Any additional amps are a strain to the system as a whole and will be converted into heat. We all know heat is not good for motors or electronics. How much is too much will be a gamble and up to the engines to decide how much they can handle. I personally don't like to see more then a few milliamps.
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