American standard train transformers such as those by MTH probably should not be operated on 50Hz. A step-down 220 to 110-120 that doesn't alter wave form should be ok to power the train transformer, BUT that does not solve the 50Hz issue. I'd contact MTH or Lionel or MRC for the official answer. I note that MTH does make trains for the European market, so they must face this issue.
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