English: Pennsylvania Railroad streamlined class K4s steam locomotive #1120.

This image has been scanned from a PRR promotional booklet entitled Presenting a Line of Modern Coal-Burning Steam Locomotives dated December 1944. This publication does not display a copyright notice and thus under the copyright laws of the United States at the time may thus be public domain. I cannot find a copyright registration or renewal for this work either. Thus, there is a good likelihood that this booklet and its contents are in the public domain.

If this image is not in the public domain I believe a claim of Fair Use is justified under US copyright law. The image was a PRR promotional image used in promotional materials and provided freely to the press for publication. It is being used in a manner explicitly intended by the company when the image was released; for use in articles describing the equipment of the PRR. The use is educational (encyclopedia article). The quality of the scanned image is not high and is notably inferior to one produced from the original slides or negatives. It is unlikely that its use in Wikipedia will have any effect on the value of the original photograph, if any.