Certain MTH products of a specific vintage do not work with the Z-500/750/1000 because of the chopped sine wave output. These locomotives need a "pure" sine wave and should work with a Z-4000, all postwar and prewar transformers as well as the MRC Pure Power.
They usually do not work with other modern transformers such as the CW-80 or the MRC Dual Power either, although this can be hit and miss.
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