See our post from July 10, 2010 for a cross section of the fruit.
The fruit matches the Juglans nigra fruit seen on the Missouri State University website.
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 more than 30 years, a series of developers tried and failed to develop the Corralitas Red Car Property.