History of the City of Denver Colorado, Arapahoe County
Published 1880, page 486 and 487

John I. Klock

     The foreman of the car-repairing shops of the Kansas Pacific Railroad, in Denver, is John I. Klock, who holds an enviable position in the community, both as a mechanic and an ex-soldier of the Union army. He was born in Montgomery County, N.Y. in 1836, and passed his early life on his father’s farm, working when he was old enough to assist his father during the summer months, and attending public school in the winter.  HE served an apprenticeship of three years in St. Lawrence County, learning the carpenter’s trade, and afterwards moved to Wisconsin, where he worked on a farm two years, and then procured employment from the Chicago & North-Western Railways, as bridge-builder, and subsequently, as mechanic in the car-shops of the same Company.  When the country called for volunteers to protect the Union and suppress the rebellion, John Klock abandoned the workshop and enlisted as a private in Company A. Thirty-second Wisconsin Volunteers.  Until the close of the war, when peace was declared and the cause of the Union had triumphed, he remained in the field, participating in the campaigns of Sherman’s army receiving promotion as First Sergeant of Company A., Thirty-second Wisconsin, and in April 1865, advanced to the post of Captain of Company D., One Hundred and Thirty-fifth United States Colored Infantry.   Mr. Klock came to Colorado in 1870, and has resided with his family in Denver since that time.  He is at present foreman in charge of car-repairing in the shops of the Kansas Pacific Railroad, enjoying the confidence and esteem of his superiors and fellow workmen.  He was married in Wisconsin in the year 1860.  By hard work and prudent management, he has earned for himself and family a good home in the city of Denver.   He belongs to the Masonic and Good Templars organizations, and is a member of the Grand Army of the Republic.

Additional Information: 
     I believe this John I. Klock was the son of Isaac Putnam Klock (John J. Jr., John J., Johannes J., and Hendrick Klock) The Sherman O. Klock Genealogy says that John served as a Captain in the Civil War.   If it is the same John Klock and I believe it is, he married Francis Krake.