Hi, I live near LA so I will try my best to be of help. I will have to check my Southern Californialand book and some books with historic photos of LA including the Angels Flight. That way I will verify if this type of street light in question was ever there. Also I suggest that you contact the city's Bureau of Streetlighting who is responsible for the city's streetlights. Their website is
www.lacity.org/bsl and hope this helps! I'll also get back and add more info after I check the photos.