The Network Rail closures register provides details of the North London Line and Gospel Oak-Barking closures this autumn (pages 190 and 193). As far as I can tell:
- The North London Line will be split in two from September 1st to November 16th for the enlargement of Hampstead Tunnel for container trains. The services will be Richmond-Willesden Junction and Gospel Oak-Stratford.
- For the week of September 22nd-28th, the section from Gospel Oak to Camden Road will also be closed. During this week, trains from Stratford will instead run to Willesden Junction via Queen's Park.
- From September 1st to September 28th, the Gospel Oak to Barking Line will also be closed. Major track maintenance and replacement will occur, probably not unrelated to the upgrade of the line.