What do the boards look like in the engines. I have worked or had these engines come in and they worked fine on my z-4000. But they had the original board with chip. Between the firmware in the top board, bottom board signal filtering, and the chip software there can be compatibility issues when mixing parts. This applies to the early stuff. Usually you will get clank, clank that indicates a software conflict, but in other case you may not. Now a new MTH chip should have newer modified software, but at one point a club order a bunch of chip from MTH and they were defective. Much of this is too difficult to troubleshoot over the forum. When I have the item in hand and see the board, specifically hear the sounds, specifically know what the board can and cannot do I can usually troubleshoot and fix them. But some chips will not work in some boards, and those Lionel transformers would be horrible for early PS-1 engines, regardless if they work for some of your engines. G
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