IF you have had a failure of a MTH Z-4000, please check the serial number of your unit, read below and let me know if your serial number is in the range of 119865###?
My train club has had 2 units fail, including 1 unit that failed, was repaired, and had the same failure again. The failures are either right handle inoperable or melted wire nut connector on back. Our 2 problem units are within 300 serial number units.....
Z #1 119865544 Z#2 119865245
Our club has several other Z-4000's and many of our members as well have Z-4000's and there are no reported issues and the serial numbers are not in this range.
I'll look forward to your reply.