Let's clear up some misconceptions and kill the derp and whinge before it spreads.
I was there on the first train to be halted and it was chaos.
1) waiting for 5 minutes as announcements sputter through broken PA, cant hear anything it just sounds like a chicken
2) finally driver tells us no trains going through, wait for buses
3) no staff around, no idea for buses eta
4) people en mass crossing a busy road to get to the regular suburban bus routes
5) buses must have taken 30+ or minutes to arrive, I waited around a while, went and had a drink at the Royal Hotel, came back waited a while longer, still no buses
6) no staff anywhere
7) when the buses finally began arriving, there were two
8) keep in mind while this is all going on more trains are arriving dumping more people at Clifton Hill
What really happens during a fatality on peak hour, having been in the thick of several in a past role:
Clifton Hill has, from memory, two staff on (one stationmaster, one station officer). Both will be running around trying to order buses, making remote announcements down the line and advising other management, staff and various other stakeholders. Their 'phones will be ringing off the hook. So they won't be able to attend to the throng of people. That'll be the AO's job: and it depends where they are. They have to come on site.
Dysons Bus Lines covers that part of town. If there are spare buses available off say Routes 504, 546, 567, and 508 (the four closest routes to Clifton Hill, they'll go there. If they're spare. Which you cannot bet on.
If not, they have to come from near on Mill Park. Not a close drive from Clifton Hill. This will take time, and unfortunately, station staff and AO's do not have magic powers to predict what traffic will be like. And it also depends which bus drivers are in the depot. Two is better than none.
Metrol's area, line and senior controllers will be running the show from the Clifton Hill end: the line controller will also have everything else to deal with, such as where trains are and they should be, where drivers are and where they should be and many other factors.
Also, the people in the section will need to be dealt with: there'll be a trainload of people for whom are still on the train, plus a traumatised driver, who will be taken to counselling or wherever he or she needs to go. Police, ambulances, possibly the Coroner and Metro staff will be on the scene.
Most likely other support staff, who most likely won't be at Clifton Hill (or Heidelberg) at the time will come and help out. As they cannot just be beamed Star Trek style to Clifton Hill (it's broken after they tried to use it on a bus once), this also takes time. Police may be called to block off a section of Hoddle St: again it depends on their availability. Hopefully messages are displayed at Flinders St and loop stations.This all takes time. Be patient. Be mature.
Yes, things are chaotic, but snide, snivelly little douchebaggery comments like we see quoted shows that people need to grow the f**k up.
Same thing happens whenever there's a fatal accident on a freeway that delays people. Screw anyone else, and don't worry about the fact that there's a grieving family and friends, a person who may be sent on the fast track to Post-Traumatic-Stress-Disorderville, but I WANNA GET HOME AND WATCH THE X FACTOR!!11