well the belair line would get used more if millswood, hawthorn and clapham were served during the weekday peak with the blackwood services stopping there as per "people for public transport". their statistics state that transadelaide (adelaide metro) is missing out on at least 5000 passenger trips per month by not serving them at least in peak times!
secondly it would be nice to pull into an extended eden hills loop that has been extended by 40m and a blackwood station with a longer loop and not a stupid siding that is no longer needed due to track machine storage being available in the belair sidings!
5000 trips per month eh? Do you realise how many people that isn't? In the scheme of things that is zero patrons, and here's the non difficult math that DPTI, TA, STA etc know that you don't.
If we take 22 working days in a month (arrived at by taking 4 weeks with 5 work days +2 to get to 30) we get 227 ish trips a day, these will most likely be return so we can say we have 113 passengers (plus about 60% of a person) per day, spanning three stations gives us (effectively) 38 people per day who want to use one of the closed platforms.
All the money for upgrading the platforms (they'd have to be DDA etc), money to change the timetables, blah, blah, blah and we're going to gain 38 people per day... Um, that's not going to happen.
The 38 can walk/drive/bus/I don't actually care what they do to another station or work etc.
Those numbers are generous, because we've assumed those 5000 trips only comprise working people on weekdays. If 20% of those 5000 trips are weekends then the weekday loading sees about 30 people per station per day and the weekend sees about 18 people per station per day.