Metropolitan Transit Authority (ex-Pacific Electric) blimp no. 1543 pauses at Slauson Junction as part of southbound Long Beach Line service in this undated photo. Los Angeles City Hall is visible in the distance, looming over the former PE right-of-way.
Modified based on comment
Alan Weeks Photo, Alan Weeks Collection
An additional comment by Alan:
The only Red Car painted into the MTA paint scheme. Many narrow gauge cars and buses were painted that way.