Will there even be enough crew to run all the current amount of T8 services+ additional ones once the signalling upgrades have been complete in the Airport tunnel? Hope they are training enough people well before the current worker shortage, or do people naturally drop out from rail school? Sick of waiting at that run down Glenfield station held together with duct tape left right and centre that is referred to as an "interchange stop" for 15min because the last train was late by 1-2mins on the heavily congested South line.
Revesby is no better. Train to the city pulls into Platform 1, and by the time you run over to Platform 3, the train doors start to close, meaning an extra 15min wait just to travel an additional up to 8min to Padstow, Riverwood or Narwee. It's a planned nuisance, just look at the timetable or try it yourself. No alternative modes like buses either.
In relation to M and H sets, there's no need to run 8 car sets, all stops after 7:30pm Sundays on the T8, run them express to Revesby from Central(i), front 4 cars continue onward to Macarthur, meaning you can slightly increase the service frequencies on the return legs back into the city, join them back up at Revesby (if an ex 4 car Macarthur and newly divided 4 car ex City happen to meet up) or at Central(i), and start a new Nightride shuttle/direct people onto L2/3 to take people between Haymarket and Circular Quay. You might as well do this since the current timetable allows up to 10min waits at Glenfield or Revesby for NSW TrainLink Regional trains to pass through
