Colin Rosenstiel wrote:

I don't know about Sportis which is now obsolete here but the portable
machines currently used by WAGN can do tickets to Underground zones I
think, as well as the Shere machines in Cambridge station.


Probably down to staff training issues/easier to remember the code for
All Zones TC, than look up the individual zone fares, rather then
limitations of Sportis.
We're getting Advantix on this side soon so Sportis is finally being
retired, which will be a fun few weeks on the peak trains!

--
Darren