Many already have this link, but just providing it for those who do not. It contains most of the accident reports between 1912 and 1966. You first select a year, then the particular RR. I readily found the complete report of a 1944 Kansas troop/freight train head-on that injured a now-deceased friend of mine and many others.

http://dotlibrary2.specialcollection.net/scripts/ws.dll?login&site=dot_railroads
ryarger@rypn.org