I remembered scanning these some weeks ago. It may explain a few things.
The first photo is of the GE power controller. Presumably Tatra decided that the Westinghouse design would be easier to rebuilt by low-trained staff.
The second photo show a traction motor which has failed. Maybe just the burnt section could be replaced, the rest just checked. I don’t know if it was a PCC or Boeing car.
San Francisco probably mid 1982.