Los Angeles Transit Lines bus #6339 poses for the camera at Exposition Park in 1990.
From Ralph Cantos:
It is the last known surviving example of the 300 bus order that NATIONAL CITY LINES / LATL unleashed on the streetcar loving-citizens of Los Angeles. These buses were used to replace streetcars on rail lines A - D - U and all the shuttle car lines. These GM 4506's were also used to replace older gasoline powered "brand X" buses that LATL inherited from LARY.
Ralph Cantos Collection