Month	Number Of Locomotives
1920-01-01	22458.0
1920-02-01	21940.0
1920-03-01	21950.0
1920-04-01	22073.0
1920-05-01	22727.0
1920-06-01	22850.0
1920-07-01	22759.0
1920-08-01	23094.0
1920-09-01	23198.0
1920-10-01	23478.0
1920-11-01	23257.0
1920-12-01	22994.0
1921-01-01	24141.0
1921-02-01	24202.0
1921-03-01	25009.0
1921-04-01	25183.0
1921-05-01	25169.0
1921-06-01	25266.0
1921-07-01	25144.0
1921-08-01	25213.0
1921-09-01	25315.0
1921-10-01	25564.0
1921-11-01	25150.0
1921-12-01	25158.0
1922-01-01	25109.0
1922-02-01	24971.0
1922-03-01	24957.0
1922-04-01	25039.0
1922-05-01	25214.0
1922-06-01	25499.0
1922-07-01	24473.0
1922-08-01	23413.0
1922-09-01	23205.0
1922-10-01	23860.0
1922-11-01	24194.0
1922-12-01	24211.0
1923-01-01	24228.0
1923-02-01	24633.0
1923-03-01	24783.0
1923-04-01	25133.0
1923-05-01	25413.0
1923-06-01	25534.0
1923-07-01	25667.0
1923-08-01	26321.0
1923-09-01	26923.0
1923-10-01	27256.0
1923-11-01	27148.0
1923-12-01	27018.0
1924-01-01	26896.0
1924-02-01	26986.0
1924-03-01	26825.0
1924-04-01	26751.0
1924-05-01	26960.0
1924-06-01	26915.0
1924-07-01	26945.0
1924-08-01	27149.0
1924-09-01	27350.0
1924-10-01	27319.0
1924-11-01	27111.0
1924-12-01	26777.0
1925-01-01	26578.0
1925-02-01	26645.0
1925-03-01	26564.0
1925-04-01	26645.0
1925-05-01	26664.0
1925-06-01	26703.0
1925-07-01	26654.0
1925-08-01	26761.0
1925-09-01	26893.0
1925-10-01	26867.0
1925-11-01	26572.0
1925-12-01	26471.0
1926-01-01	26406.0
1926-02-01	26366.0
1926-03-01	26297.0
1926-04-01	26273.0
1926-05-01	26359.0
1926-06-01	26459.0
1926-07-01	26534.0
1926-08-01	26583.0
1926-09-01	26727.0
1926-10-01	26792.0
1926-11-01	26460.0
1926-12-01	26316.0
1927-01-01	26172.0
1927-02-01	26068.0
1927-03-01	26036.0
1927-04-01	25848.0
1927-05-01	25875.0
1927-06-01	25908.0
1927-07-01	25917.0
1927-08-01	25986.0
1927-09-01	26279.0
1927-10-01	26334.0
1927-11-01	25861.0
1927-12-01	25787.0
1928-01-01	25829.0
1928-02-01	25624.0
1928-03-01	25609.0
1928-04-01	25504.0
1928-05-01	25362.0
1928-06-01	25239.0
1928-07-01	25263.0
1928-08-01	25206.0
1928-09-01	25344.0
1928-10-01	25355.0
1928-11-01	25044.0
1928-12-01	24967.0
1929-01-01	24776.0
1929-02-01	24685.0
1929-03-01	24558.0
1929-04-01	24438.0
1929-05-01	24337.0
1929-06-01	24256.0
1929-07-01	24240.0
1929-08-01	24179.0
1929-09-01	24392.0
1929-10-01	24435.0
1929-11-01	24176.0
1929-12-01	24007.0
1930-01-01	23868.0
1930-02-01	23626.0
1930-03-01	23631.0
1930-04-01	23569.0
1930-05-01	23608.0
1930-06-01	23548.0
1930-07-01	23586.0
1930-08-01	23557.0
1930-09-01	23660.0
1930-10-01	23660.0
1930-11-01	23323.0
1930-12-01	23176.0
1931-01-01	23025.0
1931-02-01	22861.0
1931-03-01	22720.0
1931-04-01	22697.0
1931-05-01	22644.0
1931-06-01	22522.0
1931-07-01	22515.0
1931-08-01	22285.0
1931-09-01	22200.0
1931-10-01	22172.0
1931-11-01	21958.0
1931-12-01	21776.0
1932-01-01	21510.0
1932-02-01	21124.0
1932-03-01	20870.0
1932-04-01	20816.0
1932-05-01	20605.0
1932-06-01	20540.0
1932-07-01	20444.0
1932-08-01	20284.0
1932-09-01	20094.0
1932-10-01	19858.0
1932-11-01	19586.0
1932-12-01	19460.0
1933-01-01	19219.0
1933-02-01	19003.0
1933-03-01	18783.0
1933-04-01	18663.0
1933-05-01	18383.0
1933-06-01	18169.0
1933-07-01	18036.0
1933-08-01	17901.0
1933-09-01	17981.0
1933-10-01	17940.0
1933-11-01	17799.0
1933-12-01	17684.0
1934-01-01	17564.0
1934-02-01	17463.0
1934-03-01	17355.0
1934-04-01	17200.0
1934-05-01	17134.0
1934-06-01	17328.0
1934-07-01	17292.0
1934-08-01	17257.0
1934-09-01	17348.0
1934-10-01	17256.0
1934-11-01	16982.0
1934-12-01	16882.0
1935-01-01	16773.0
1935-02-01	17106.0
1935-03-01	16922.0
1935-04-01	16827.0
1935-05-01	16860.0
1935-06-01	16809.0
1935-07-01	16670.0
1935-08-01	16670.0
1935-09-01	16700.0
1935-10-01	16706.0
1935-11-01	16684.0
1935-12-01	16589.0
1936-01-01	16732.0
1936-02-01	16988.0
1936-03-01	16930.0
1936-04-01	16843.0
1936-05-01	16869.0
1936-06-01	16922.0
1936-07-01	17070.0
1936-08-01	17152.0
1936-09-01	17242.0
1936-10-01	17484.0
1936-11-01	17541.0
1936-12-01	17522.0
1937-01-01	17668.0
1937-02-01	17754.0
1937-03-01	17768.0
1937-04-01	17784.0
1937-05-01	17848.0
1937-06-01	17886.0
1937-07-01	17968.0
1937-08-01	18034.0
1937-09-01	18081.0
1937-10-01	18065.0
1937-11-01	17944.0
1937-12-01	17861.0
1938-01-01	17628.0
1938-02-01	17381.0
1938-03-01	17250.0
1938-04-01	17184.0
1938-05-01	16994.0
1938-06-01	16782.0
1938-07-01	16700.0
1938-08-01	16630.0
1938-09-01	16641.0
1938-10-01	16547.0
1938-11-01	16424.0
1938-12-01	16426.0
1939-01-01	16338.0
1939-02-01	16143.0
1939-03-01	16128.0
1939-04-01	16190.0
1939-05-01	16050.0
1939-06-01	16010.0
1939-07-01	15986.0
1939-08-01	15948.0
1939-09-01	16100.0
1939-10-01	16338.0
1939-11-01	16560.0
1939-12-01	16800.0
1940-01-01	16944.0
1940-02-01	16820.0
1940-03-01	16668.0
1940-04-01	16640.0
1940-05-01	16596.0
1940-06-01	16506.0
1940-07-01	16564.0
1940-08-01	16755.0
1940-09-01	16752.0
1940-10-01	16786.0
1940-11-01	16900.0
1940-12-01	16778.0
1941-01-01	16740.0
1941-02-01	16762.0
1941-03-01	16734.0
1941-04-01	16828.0
1941-05-01	17060.0
1941-06-01	17246.0
1941-07-01	17501.0
1941-08-01	17748.0
1941-09-01	17901.0
1941-10-01	18160.0
1941-11-01	18246.0
1941-12-01	18280.0
1942-01-01	18502.0
1942-02-01	18619.0
1942-03-01	18691.0
1942-04-01	18788.0
1942-05-01	18882.0
1942-06-01	19004.0
1942-07-01	19109.0
1942-08-01	19182.0
1942-09-01	19277.0
1942-10-01	19526.0
1942-11-01	19507.0
1942-12-01	19379.0
1943-01-01	19446.0
1943-02-01	19446.0
1943-03-01	19413.0
1943-04-01	19422.0
1943-05-01	19460.0
1943-06-01	19488.0
1943-07-01	19556.0
1943-08-01	19483.0