Local hobby shop did a factory reset. Had it running for 25 minutes at 30 scale mph. Ran fine. I took it home. Started running it at 30 scale mph conventionally (I have 2 poles 3 feet apart on my layout so I can calculate train speed). Ran fine for 10 minutes. Increased speed to 50 scale mph. Made one loop and then shut off. Back to square one. So back to the hobby shop it goes. It is most definitely speed related. It was tested under DCS and conventional power under 35 scale mph and works fine.
So as a recap:
MTH Premier GS4 Daylight, originally PS1, converted to PS2 3V. Locomotive is being operated conventionally by a Postwar ZW with added external circuit breakers and TVS diodes. Locomotive has not derailed or shorted in any way. Any speed above 45 scale mph with speed control on or off one of two things will happen. Either:
The locomotive shuts off completely. Motion, smoke, and sound turn off with no shutdown sounds. If track power is turned off for 10 seconds locomotive will play startup sounds and run normal.
The locomotive will run but lose sound, smoke, and directional control. It will be locked in its current direction of travel. If track power is shut off for 30 seconds or more and turned back on locomotive will play startup sounds and operate normally again.
If 45 scale mph is exceeded again one of the above two scenarios happens.
The tach tape is fine. I checked. I can't think of anything else to check.
If the board is shot I may just gut the PS2 out of the locomotive and install a Dallee reverse unit and Lionel Daylight railsounds board. It would be cheaper and I won't miss the PS2 command functions since I run conventionally.
This is the first "high tech" locomotive I've bought. Thus far I am not impressed. All my old 90's QSI reverse unit/PS1/TMCC/RailSounds II&III "junk" works just like the day I bought it.
