Peter Masson wrote:

It's been 4tph Mondays to Fridays for quite a time, and IIRC it's never been
less than 3tph. Saturdays has recently iuncreased from 3tph to 4tph, and
Sundays from 2tph to 4tph, presumably as part of TfL's 'Overground Network'
scheme. Are TfL subsidising the increased weekend frequency?

Going back to 2000, it was every 15 minutes weekdays, every 20 minutes
Saturday and every 30 minutes Sunday.

Quite an unusual service pattern - I don't think there are that many
routes that have a different frequency on weekdays (excluding peak
periods) to Saturday.

--
Stevie D
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