There are no copyright marks on the photo as can be seen by looking at the front and back.
A search for original copyright registrations was done in artwork for the year 1936. Nothing was listed as registered by Acme Newsphotos. There's no evidence of any copyright registration.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
{{Information |Description=Photo of the New York Central's Mercury locomotive. |Source=[http://www.ebay.com/itm/1936-Original-Photo-NEW-YORK-CENTRAL-Streamliner-MERCURY-by-HENRY-DREYFUSS-/281435357337?pt=LH_DefaultDomain_0&hash=item4186dac099 eBay] [ht...