Woolstores - Byford obviously didn't have the population for a train service when the Armadale line was electrified and you are right in saying that's why it wasn't electrified at that time. But it does have the population now so to say it doesn't warrant a service is simply false.
Remember suburban diesel railcars did used to serve Byford.
The PTA were foolish selling all the ADL railcars. One could have traversed the Armadale line to provide a 2 or 3 hourly service for Byford.
Pipe dreams, Jarroo.
Regardless of population size or density, it's never going to happen without the railcars to support it. With the current fleet struggling with peak hour services (in addition to previously cancelled railcar orders), the next arrival of new railcars will be immediately be used to boost current services. With Barnett in power and a airport rail link on the cards, I can't see the Byford extension happening for a long time.
As with the ADL's, they are currently reaching the end of their operational life and are in the midst of being withdrawn in New Zealand. And as you say, the Armadale Line "obviously didn't have the population for a train service" at the time of electrification. So that seems pretty pointless holding onto an ageing railcar fleet in the hope that the service may one day become viable.
With that said, we're kind of getting away from the thread topic, aren't we?...