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Hi I'm new to this, so please bear with me. I run an N gauge layout with 3 locomotives, A class 68 with sound pulls 4 carriages all with internal light bars. A class 37 goods train and a Class 156 2 car set. On occasions I experience all loco's stopping and the Gaugemaster Prodigy Express 2 controller displaying SAdA 0065. This clears the Class 68 loco runs but the other 2 remain stationary. I clean the track but dont have a wheel cleaner as yet, any suggestions as to the cause of this problem. Thanks for your prompt response. Prior to putting this post on the problem was quite frequent, having spent the last hour running various combination of loco's I've only had it occur once with loco's 5 & 6 operational. The display dimms when it occurs which as you say would be the result of a short some where on the tracks. I have experienced odd occurrences when the layout has been dormant for a period and on this occasion we've been on holiday for a week. If it continues I will try to identify the possible cause of the short, it seems so random not quite sure where to start. I'll try running loco's and flexing the controller lead to see if that reproduces the fault.  Would an increased load on the system reproduce this kind of fault. I'm thinking, I have an incline on the layout about 3 deg, the class 37 is slowing down towards the top of the incline, the class 37 has internal lighting as well. Is there any way of checking the current being drawn. Just realized that the fault occurred when the class 37 was stationary.  Sounds like a short some were or the controller lead disconnecting, the clips on the leads are not the best, I changed all mine for Cat5 leads. Something else you can do to stop the system shutting down on a short is wire a 12v, 21watt car bulb into one of the two power feed wires from the main unit. I did this on Whiteoak Light Railway and it tranformed the running against accidental shorts. When you get a short, the bulb lights and takes the strain off the main unit and gives you a goid indication of a short. There are more technical versions of this, I just kept it simple. There was one point where the blades were not exactly in sync with the polarity change over in the IP Digital when turning to the branch and this resulted in a short circuit which was long enough the trip the EB1 but then disappeared when the movement had been completed and everything was back in sync.