Quarter	Millions Of Wagon-Miles
1931-01-01	765.000
1931-04-01	730.000
1931-07-01	734.000
1931-10-01	740.000
1932-01-01	724.000
1932-04-01	678.000
1932-07-01	660.000
1932-10-01	700.000
1933-01-01	694.000
1933-04-01	661.000
1933-07-01	699.000
1933-10-01	752.000
1934-01-01	770.000
1934-04-01	715.000
1934-07-01	732.000
1934-10-01	758.000
1935-01-01	759.000
1935-04-01	719.000
1935-07-01	737.000
1935-10-01	792.000
1936-01-01	796.000
1936-04-01	761.000
1936-07-01	778.000
1936-10-01	824.000
1937-01-01	817.000
1937-04-01	812.000
1937-07-01	806.000
1937-10-01	831.000
1938-01-01	807.000
1938-04-01	732.000
1938-07-01	716.000
1938-10-01	775.000
1939-01-01	783.000