WARNING! D: (Pull It Yourself: Part 4)

As mentioned in the past three posts in: Pull It Yourself, Pull It Yourself: Part 2 and Pull It Yourself: Part 3, I've been observing the strange motions of the CountryLink door locking system.

My hypothesis up until this moment had been that...

• The self-sliding door on the side of the railway tracks would open if, the door handle was loose and dodgy. Only then would the unlocking also affect these doors.

I HAVE BEEN PROVEN WRONG.
It was an ordinary day.

Monday 23rd May
Parramatta to Central: Sydney Terminal train.

We boarded. I noticed that the handle was stable and did not budge from its upright position. Would this door slide open? I doubted it. Chatter, chatter, chatter. The scenery whooshed by and the train drove on.
Upon arrival at Sydney Terminal, I yanked the door handle but it did not open. : ) I believed that my hypothesis was therefore indeed true and perhaps we were indeed safe from falling onto the railtracks.

Akira: "So you can't open it." :/

However, I persevered...and though it may have looked suspicious at that moment because it seemed as if i was purposely trying to force open CityRail property...it's not like I was trying to steal the door handle or anything.
Anyway, I jerked it around... and it slid open.

SHOCK HORROR!!!

CityRail!! How unsafe! D: All these times I thought you were simply careless with your CountryLink door handles and in repairing them! But now...I must see this in a different light.
Are they truly not bothered to execute a parallel processing unit in which only one side of the train's doors are unlocked at a time? Catching the trains, I know that the doors are locked whilst in motion...so why are they completely unlocked upon arrival at Sydney Terminal? I cannot believe that they would wish for someone to fall accidentally on the tracks because they kicked the door by accident - much like I did in my first post on this matter, without the falling however.

Yet, the confusing part is; when we board at Parramatta, I'm about 83% sure that the doors are locked firmly on the rail-facing side. Perhaps I should've jerked it around a bit to check.

Unfortunately, my dear readers...this investigation MUST CONTINUE! D:

New Hypothesis

• As the CountryLink terminates at Sydney Terminal, it does not take into consideration that it is necessary to lock half the doors anymore and therefore saves electrical effort in unlocking all the doors at once. (I doubt that really makes a difference...) Also for the "end of a journey" kind of effect. : )
  Hence this explains why it is locked at Parramatta and not at Sydney Terminal.

We shall soon see...