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Hi, I have been running my MTH Railking OneGauge engines since 2006 with DCS ver. 4.20 and TIU rev. H2. I always use “Fixed voltage in 1†and “Fixed (DCS) out1â€. We have 230-240V 50 Hz over here and I am using a LGB 50110 18V, 100VA transformer. The problem is that the TIU can’t find the engines anymore and the engines automatically turn sound and lights on when the power is turned on. Regardless of polarity. It started a week ago when it was unusually warm (for Swedish conditions - 80 degrees). I was running Big Boy and SFE “Hudson†with 4 more engines on the tracks (not started). The tracks also fed the lights for13 coaches and 3 cabooses and 24 other light bulbs. The LGB transformer wasn’t overloaded but overheated after about 5 minutes. After that the problems started. However, the day after I checked the engines and they behaved as usual. Yesterday I made two engines ready for a session. I just fetched their cars from the yard with no problems. An hour later (left with power off) the engines started sounding with the lights on but unreachable from the remote (now connected with cable). After removing one of the engines and “E-stopping†a couple of times, the engine was silent on power on. I left if for about half an hour to charge the batteries – to find out if that was the problem. After that it started and ran normally. I tried to do the same with the other engine but it never went quiet. After that the first engine behaved like the second again. Same result with the other engines. I tried again today, hoping that it would work again, but now the problem seems to be permanent. I also tried the transformer I used before the LGB. Same result. I found this forum about a month ago and from what I have read so far I am sure you can correct me if the TIU isn’t the problem. I think a new TIU is the solution. Regards, Bjorn