In about 1963, I was seven, and I managed the one time, with some difficulty, to get onto the station platform, which was quite gloomy. Nostalgic about the station, and the signal (?) tower.
Usually, we would get onto the line, closed off, by crawling through a hole in the fence at the top of Cranley Gardens, or squeezing through a hole in the railings on Muswell Hill Road.
It was like a secret private playground for kids.
The rail bedding was still there, overgrown with grass. Pigeons under the bridge at Cranley Gardens, the station still there with ticket office, platforms, and waiting room. Going towards Highgate, there was a signal cottage (now gone) further up on the right, past the pumping station. Going towards Muswell Hill, there was like a small air raid shelter on the left (now blocked off/filled in). Further along, the way was blocked with corrugated iron, and allotments were on the left hillside (now just a small wooded area). The allotments could be accessed from St James Lane. The viaduct was blocked with corrugated iron. Further along the tunnel under Muswell Hill was wider, with room for a tube train to pass through.

Very sad to see this film.Now more than ever the Muswell Hill area could greatly benefit from a rail service

Of course there wasn't the traffic on the roads in the 1950's