Although the destination boards suggests Pasadena Short Line, it is believed this image was taken at Brand and Glenoaks – Metropolitan Coach Lines (ex-Pacific Electric) no. 5160 turning on to Glenoaks from Brand. This could possibly be some sort of railfan special, which would explain the erroneous destination sign (it was common to put any sign up during railfan trips).
 
Bill Whyte Photo, Steve Crise Collection