Ivor The Engine wrote:

Oyster FAQ is of little help...
You only need to set an Oyster Extension Permit when you start a
journey within the zones covered by your Travelcard and want to travel
outside those zones on National Rail

We didn't "want to travel" on NR, it was simply more convenient at the
time...

Has anyone ever pointed out the inconsistency between NR policy on
permitted routes and the London Zones?

e.g. take the former Manchester to Derby Voyager service. Tickets M-D
were valid on it because it was a through train, even though it went via
Birmingham, and M-D tickets were not valid there. In contrast, the Zonal
validity is applied when trains pass through zones, even if they are
through services.



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http://gallery120232.fotopic.net/p9632955.html
(43 082 at Longbridge, 10 Jun 1995)