From what I understand, generally speaking a convex platform curve's resultant cant means a tilt inwards to the platform, resulting in a step up off the train; a concave platform curve results in a can away from the platform, leading to a step down off the train. This is assuming that the platform is at the perfect door sill height for perfectly level track.
I must say, in this regard reverse curves are hard to beat. How many stations actually have reverse curves besides Beecroft?
* Belmore seems to have a severe reverse curves and sharp radius, which imposes a severe speed limit entering and leaving.
* Turramurra down platform has a sharp curve and straight which imposes a speed limit of IIRC 40.
* Gordon down platform P3 may have a gentle reverse curve. Needs a closer look.
* Canterbury terminating platform, now disused, had a wierd corkscrew. This cleared the original corkscrew road overbridge of which the abutments still remain, until perhaps the SSFL demolishes it.
* Liverpool terminating platform used to have a wierd corkscrew, but has since be straightened.
* Newtown island platform had Up and Down sides at different levels, and there was a step with handrail to get from side to side, With reconstruction of the whole station, the island platform is now level with no steps.
Other places with steps, or fences where the island platform is uneven for part of its length include.
* Harris Park P1 & P2.
* Cannot remember another station where I saw this unevenness.