This CD contains a PDF copy of a book maintained by MP which includes details of rail accidents from 1931 through 1960.
From the back cover:
This book is a handwritten record of rail accidents which occurred on Missouri Pacific Lines from January 1, 1931 through December 31, 1960. The information for each accident includes date, division, station, train number, engine number, conductor and engineer names, nature of accident, and number of engines and cars off the track. In addition to raw statistics, the data in these pages shows what locomotives were used on various main and branch lines from 1931 to 1960.