Text this: A Statistical Analysis of Carriers' Monthly Hours of Service Covering All Railroads which Reported During the Year Ended June 30, 1940, Instances in which Employees were on Duty for Periods Other than those Provided by the Federal Hours of Service Act, Together with a Comparative Summary Covering the Years Ended June 30, 1936, 1937, 1938, 1939, and 1940.