"John Rowland" wrote in message
...
"D7666" wrote in message
om...

The problem with this is where will it end.

If zone 6 is extended to include stations which are currently
just outside the existing area, then any stations which then lie
outsdie an enlarged area look as if they can be justified too.

There are few places where a train journey from one part of the zone system
to another can be most quickly performed by going outside the zones.
Dartford and Epsom are the only two obvious ones: perhaps Cheshunt and
Epsom
Downs / Tattenham Corner as well.

St Mary Cray - Knockholt (via Sevenoaks)?

Peter Smyth