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Dear Mr. Yapp,
There are no extant engineering drawings or photographs of locomotives in Record Group 14. You might wish to consult Reference Information Paper 116 - Records Relating to Railroads in the Cartographic Section of the National Archives (2010). Engineering drawings of locomotives, if they exist among accessioned federal records at NARA, would be in the custody of the Cartographic unit. You can contact the unit directly at email@example.com.
You might also wish to contact the Railway & Locomotive Historical Society, Inc. for information about engineering drawings of locomotives for the World War I period.
Thank you for contacting History Hub. Best of luck in your endeavor.