Operator should announce the station just as the doors are opening. Too often, when the train comes to a stop, you can't see the station name, after having missed the announcement the operator made 30 or more seconds before the train came to a stop.
This is the result of many years of asking fellow passengers where I am. The time when many of us are paying attention is when the doors open! That's also when the announcement can be most easily heard as it is not competing with the sound of the train's movement.