It is disputed whether the copyright tag on this file is correct. In some cases this may be because the stated source or other information is not sufficient to prove the selected tag is correct. Reason: Cropped Otto Perry photo from 1936, within copyright protection [1]
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Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country. Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Colorado_%26_Southern_RR_engine_number_9.jpg