On Thu, 14 Jan 2010 17:32:09 -0800 (PST), Mizter T wrote:

(This was of course back in the pre-LO dark ages when it wasn't valid
on the DC line at Kilburn High Road or South Hampstead, not north of
H&W - the fact that TfL manage to negotiate PAYG being valid north of
Queen's Park was arguably in itself a minor miracle, given that
traditionally mainline fares - i.e. BR/NR - applied on this stretch of
the Bakerloo line.)

At the time PAYG was introduced, Queens Park - Kenton was
interavailable; it was only Kenton - H&W that was NR fares only.