In message , at 10:09:58 on
Tue, 16 Sep 2014, Paul Corfield remarked:
Starts today, and featured on BBC TV local news.

Unhelpfully they show someone touching a reader and being told they've
been charged £1.35, that must be a bus, shirley?

Could be a discounted PAYG journey on rail.

How does the gate know to apply a discount, and where the journey is
going to end?

The bus fare was £1.35 two years ago and I don't think any CPC
functionality was live back then. I do recall Tom Edwards (BBC London)
doing a feature on CPC use many months on the buses where you see a
card being touched in on a NB4L.

It could of course just be a mock-up.
--
Roland Perry