So I emailed Red Car Property neighbor, blog contributor and Backwards Beekeeper Russell Bates. He responded,
"That's pretty cool! I would guess that either:
--there's something sweet in that soil that they want, or
The Corralitas Red Car Property was a private right-of-way through Silver Lake (Los Angeles) for the Pacific Electric interurban streetcar. The “Big Red Cars” ran until 1955 when the Glendale Line was decommissioned for freeway construction. For almost 40 years, a series of developers tried and failed to develop the Corralitas Red Car Property.
It's not a park, it just looks like one.