[fredv]

Seing the wiring diagram without switch rail, it seems obvious that the solenoid is always energized above 28mph whenever the dash control handle is pushed or pulled, but I was thinking that I missed something.
Thanks for the clarification.
The transmission is working without grinding when the dash control handle is pulled AND the OD electrical system not energized (with the power source from coil disconnected on the relay).
There is a grinding with system energized at the speed the OD is supposed to engage, and little noise when the car speed falls below 22mph (with the dash control pulled or pushed), no noise at all when electrical system is disconnected.
The rail seems to be operative, as it disconnect manually the OD.
Regarding electric controls of the OD, the only thing that I found is that when the solenoid is attached to the adapter for grounding contacts check with the white wire from the governor grounded, engine shall stop when the kickdown switch is pressed but it didn't.
I checked with the used solenoid and the new, and engine didn't stop.

The pawl engage the blocker ring during the test.
Ring and gear plate assembly were changed during transmission overhaul.