And who knows.. maybe in 20 years time the Sydney transport people can acquire this system second (maybe third) hand!
New technology turns your body into a swipe card

He said future applications could include a walk-through ticket gate, a cabinet that opens only to authorised people and a television control that automatically chooses favourite programs.
...
NTT Electronics Corp, a group company, plans to start sales of the room-entry system in the coming months, probably in the spring, said NTT business creation official Toshiaki Asahi.

It will be the world's first commercial application of human body communication using electric fields, rather than sending electric currents into the human body, according to NTT.

Sydney are amateurs when it comes to overpriced, nonworking technology for tickets! Ours is $1 billion and 15 months behind schedule. For that price we could abolish all the machines and hire conductors for ten years, and have some change to buy a few more trains. "But what about after ten years?" Well, we change our ticketing systems every 5-10 years anyway... in the early 1990s we had "scratchies", then we had the stupid "validate your ticket" things, and now this one.

I spent a couple of months working for ERG, many years ago.

That was one contract I was very keen not to renew - amateurs...