A similar story to Wendy's Secret Garden in Sydney, Australia?
https://www.wendyssecretgarden.org.au/
After her husband's death in 1992, Wendy Whiteley took to cleaning up an unused railway easement behind her house. It turned into a substantial garden. The railways refused to guarantee its future (it was on their land), but in 2015 it became an official park. Well worth a visit on a sunny afternoon if you are in Sydney.
I think this is a great story.
For those who aren't aware, that strip of land is probably some of the most valuable residential land on earth.
HK: $200,000+/ sq m (for premium properties on The Peak)
Monoco: $56,000/sq m
Milson's Point (next to Wendy's Secret Garden): $33,000/sq m
Pacific Heights, SF: $22,000/sq m
(According to my/ChattyG's calcs)
There's a children's book that I've been reading to my daughter called The Curious Garden about a boy gardening on abandoned tracks. It's a reference to the High Line, of course, but it's interesting there's more than one like this. I suppose the end of the age of passenger rail in these countries offered opportunities like this.