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Unread 09-08-2011, 09:08   #9
Thomas Ralph
IT Officer
Join Date: Sep 2007
Location: Greenwich, London
Posts: 1,860

The MAC number is just a checksum for the origin, destination, ticket type, and date, which is why you can do same-day bookings. Drivers' ticket machines aren't synchronized, they just put a module (effectively a memory card) into a networked machine when they book on and that module goes into their ticket machine.

I'm sure if they thought about it for a while they could get around the requirement to have the booking on paper however.
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