SP Tank Car?
Again courtesy of the Vintage Portland website (https://vintageportland.wordpress.com/) here is a 1934 photo taken in Portland, OR. The location is SE McLoughlin Boulevard
and the railroad tracks belong to the Southern Pacific.
Off to the right of the photo is a string of tank cars, one of which may be a Southern Pacific car.
Click on the photo to enlarge it. There is not much real detail, unfortunately.
It’s hard to identify this spot today as the area to the right of the tracks looks completely different. A clue is that the highway starts to curve off to the left. It possible this is the area currently just south of the large intermodal yard crossed by Holgate Boulevard.