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It is the 112th Engineer Train, here is a link to a book which talks about the operations of the 37th Division during WWI: #13 - Summary of operations in the world war : [.... Division] ... 37th division. - Full View | HathiTrust Digital Library | HathiTrust Digital Library
Maps showing 2 major offensives: txu-pclmaps-oclc-6205448-37th-division-avocourt-meuse-argonne-sep-23-25-26-oct-3.jpg (4994×8182) (utexas.edu)
All links from our local Perry Castaneda Library at the University of Texas.
Texas Military Forces Museum
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Dear Ms. Norton,
Thank you for posting your question on History Hub.
The First World War selective service (draft) records (including the 4th registration) are in the custody of the National Archives at Atlanta, 5780 Jonesboro Road, Morrow, GA 30260. The email address is email@example.com.
We also recommend requesting your great grandfather's Official Military Personnel File (OMPF). OMPFs and individual medical reports for enlisted men of the U.S. Army who were separated from the service after October 1912 and prior to 1955 are in the custody of NARA's National Personnel Records Center in St. Louis. In many cases where personnel records were destroyed in the 1973 fire, proof of service can be provided from other records such as morning reports, payrolls, and military orders, and a certificate of military service will be issued. Please complete a GSA Standard Form 180 to the best of your knowledge and mail it to NARA's National Personnel Records Center, (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002.
Using the OMPF, you will hopefully be able to verify the unit to which he was assigned during his service. Looking at the World War I Order of Battle, it appears the 37th Infantry Regiment only had the 112th Engineer Train, but not a 12th, so that is the most likely unit based on the information you already have.
The National Archives at College Park does not have duplicates of the World War I service records that were destroyed in the 1973 fire at the National Personnel Records Center. We do, however, have several different types of records for divisions, regiments and other units of the American Expeditionary Forces in World War I. These include war diaries, historical files and organizational records, and unit strength returns. It should be understood that these records seldom, if ever, contain information on individuals. Strength returns will usually show the number of men in a unit, but will not list their names; occasionally there will be a roster of officers. There is usually a brief "record of events" for the month of the return. We have strength returns at the company level for most units. War diaries and historical files were created at the divisional and regimental levels. War diaries consist of brief entries on forms prepared daily. Historical files are working papers which may include manuscript histories although these are generally less complete than available published unit histories.
At the National Archives at College Park, World War I unit records are in the Record Group 120 - Records of the American Expeditionary Forces (World War I) series "Records of Divisions, ca. 1918 - 1942". Boxes 8 - 15 of the 37th Infantry Division records hold the units under the division. We do not have a file index for the series so we cannot confirm if records for the 112th Engineer Train are present at this time. Please contact the Reference Branch at firstname.lastname@example.org for more information on these records.
You can also search online for Facebook groups or groups hosted by other websites for collected history of the 37th Infantry Regiment.
We hope this information is helpful in beginning your research.
The National Archives and Records Administration