I see this Treasury Announcement 17 Aug 2019
https://www.gov.uk/government/news/600-million-boost-for-housing
includes "£156 million for the ‘Meridian Water’ bid from Enfield to deliver rail works, road infrastructure, land remediation, flood alleviation and utilities to unlock up to 10k homes"
From looking on Enfield Council website it looks like the rail works
https://governance.enfield.gov.uk/documents/s73011/20190204 OSC Meridian Water final.pdf
will include doubling the new siding from Tott Hale to Meridian Water, with a new 4th platform at Meridan Water. The Enfield briefing note is from 2 Feb 2019 and says earliest time for 4tph is Dec 2019!!
"2.3 A full 4tph service will be enabled by the HIF rail infrastructure works with the earliest operation of a full 4tph service in December 2019.
3.5. The rail improvement works will provide an additional (4th) track from just north of Tottenham Hale to the new Meridian Water station, together with the construction of the 4th platform at Meridian Water station and the associated signalling and electrification works. These improvement works could facilitate a train service of up to 6-8 trains per hour at the new Meridian Water station."