Jason wrote to uk.transport.london on Fri, 8 Oct 2004:

On Fri, 8 Oct 2004 12:57:23 +0100, Annabel Smyth
wrote:

Someone today had a weird message come up on the reader: "Passback
attempted!" What does this mean and what had he tried, however
unwittingly, to do?

I *think* that means a second attempt to use the ticket has been made
- i.e. someones passed it back over a tube barrier to someone else to
exit, or someone passed it out a bus window for someone else to use.

Otherwise, I'm sure I'll be corrected! :-)

That figures, as I think he tried to touch in twice - the driver thought
he hadn't seen what it said the first time, I think.
--
"Mrs Redboots"
http://www.amsmyth.demon.co.uk/
Website updated 26 September 2004