Quarter	Millions Of Train-Miles
1931-01-01	34.0600
1931-04-01	32.0400
1931-07-01	32.4600
1931-10-01	32.4700
1932-01-01	32.1100
1932-04-01	30.6400
1932-07-01	29.9700
1932-10-01	30.9000
1933-01-01	31.2100
1933-04-01	29.4000
1933-07-01	30.7200
1933-10-01	32.2700
1934-01-01	33.4400
1934-04-01	31.3700
1934-07-01	32.0700
1934-10-01	32.9800
1935-01-01	33.4500
1935-04-01	31.2700
1935-07-01	32.1700
1935-10-01	33.6900
1936-01-01	34.6000
1936-04-01	32.7200
1936-07-01	33.6100
1936-10-01	35.0300
1937-01-01	35.5300
1937-04-01	34.3100
1937-07-01	34.8400
1937-10-01	36.0600
1938-01-01	35.9500
1938-04-01	32.8000
1938-07-01	32.0800
1938-10-01	33.9400
1939-01-01	34.2100
1944-01-01	32.4100
1944-04-01	33.6700
1944-07-01	34.0000
1944-10-01	33.5800
1945-01-01	31.2800
1945-04-01	31.8800
1945-07-01	30.5800
1945-10-01	29.7600
1946-01-01	29.9300
1946-04-01	29.7600
1946-07-01	29.9300
1946-10-01	28.9700
1947-01-01	25.5000
1947-04-01	28.8900
1947-07-01	29.0100
1947-10-01	29.5000
1948-01-01	29.9300
1948-04-01	28.8400
1948-07-01	29.1100
1948-10-01	30.6300
1949-01-01	30.9300
1949-04-01	29.6300
1949-07-01	29.3100
1949-10-01	30.3200
1950-01-01	30.9400
1950-04-01	30.6300
1950-07-01	30.8300
1950-10-01	31.6400
1951-01-01	31.5800
1951-04-01	31.4700
1951-07-01	30.5500
1951-10-01	31.6900
1952-01-01	32.0200
1952-04-01	30.6800
1952-07-01	30.0300
1952-10-01	30.9200