Evelyn,
You may want to look at the Quincy, IL Library archives page. They have an online newspaper database that covers Lincoln's death, funeral, etc. This is a free website. Some of the articles are really long, but they do mention the names of at least part of the higher ranking officers who were Honor Guards.

The funeral train took what, a week or better, to get to Illinois? I just recall it was a long time, and the papers covered most if not all of the details.

Hope this helps. Do you need a census lookup?
Ann