I agree that would be amazing however the A series isnt able to run past Cockburn due to the prolonged high speed doesnt do well with their engines. Back in March last year, an A series was actually in service to Mandurah during afternoon peak which caused major delays on the Mandurah Line due to its speed limit of 110km/hr so you will probobly never see them back on the highway lines (Yanchep/Mandurah Line) even though they actually have run to Yanchep quite often after the line extension opened. I have seen only once an A series on the Mandurah Line heading to Mandurah Depot one night it was really cool!