On 2012\09\27 07:27, Stephen Furley wrote:

Automatic Train Operation was tested on the Woodford - Hainault
section before being introduced on the new Victoria Line. Was this
section operated as a shuttle between these stations at that time, or
did trains in passenger service run through at one or both ends, and
just switch to ATO when running on the line so equipped?

It was a shuttle. I would imagine only one train or perhaps two trains
were so equipped.

Did the ATO
system remain in use on this line after the Victoria Line opened?

No.