Nestor Badudoy wrote:

Willesden Junction used to be a boundary station, then they made it Z3 only.
I guess they wanted increased revenues from all the services that ran thru
there (e.g. the old North London Lines services from Richmond and the
cross-London services from Clapham Junction and beyond).

I agree that Stratford would be a good boundary station, but that wouldn't
happen, esp when the CTRL opens up thru that area. INCREASED REVENUE!

Yes, I think revenue is the point. Otherwise you could get a very long
way on a 1-zone ticket.

It wasn't always so. In the 70s there was a 25p day return to any
station on the line, though it admittedly only went to Broad Street
then. Useful for getting from west to east London cheaply.

Colin McKenzie