On Sun, 17 Jun 2007 10:37:06 -0000, XmaX wrote:

Hi, I often travel from Z2 to Z4 via Z1. Can I buy a Z234 travelcard,
or do I need a Z1234? I assume that it might be fare evasion if I use
it, but will it let me through the gates?

Depending on which stations you're travelling between, the Oyster
system should automatically knock the Z1 extension cost off your
pre-pay balance. If your pre-pay balance drops below zero, the gates
won't let you into the system.


Assuming I understand the system right!