Year	Number Of Locomotives
1921	48169.0
1922	47682.0
1923	47762.0
1924	47625.0
1925	46074.0
1926	45044.0
1927	43922.0
1928	42668.0
1929	40905.0
1930	40422.0
1931	39449.0
1932	38275.0
1933	36663.0
1934	34834.0
1935	33728.0
1936	32563.0
1937	32086.0
1938	31450.0
1939	30206.0
1940	29246.0
1941	28828.0
1942	28673.0