The Northern Heights project

A while ago, I came across a 1939 tube that had extra bits that are not on today's map.
As I explored what this was, I decided that I would walk the disused parts and make a video.
In this video, I have tried to explain the best I can!
I have also found other links that I found helpful:
Big tube
en.m.wikipedia...
Parkland walk
www.parkland-w...
Capital Ring walk
innerlondonram...
Brief History
trainstobeyond...
Northern Heights walk
www.jont.org.uk...
Geoff Marshall line diagram animation
• Northern Heights Anima...
London's Lost Railways Ep. 13 - Parkland Walk
• London's Lost Railways...
Alexandra Palace’s Never-Opened Tube Station - Jago Hazzard
• Alexandra Palace’s Nev...
The unfinished Northern line
trainstobeyond...
The unfinished Northern line
• The unfinished Norther...
The Northern Heights Project - A Web Of Mystery In North London! | Another Station, Another Mile #10
• The Northern Heights P...
If you have an interest in the London Underground, you might like to have a look at a website that I have created: www.tubeopedia.co.uk