That much is well known, but answer me this:
When the above crossovers were not being used (at other than peak hours), trams used a facing crossover at the south end of the platform to reach the stub tunnel at the south end of the down track (ready to change poles and proceed into Platform 2 for their next load).
The stub tunnel at the south end of Platform 1 was used to store/refuge service vehicles and defective cars.
How was entry to this latter stub or the facing crossover controlled?
This may seem like historical (59 years ago) trivia, but someone must know . . .