Early 20th Century

Early 20th Century locomotive production in the USA included units made for both domestic and export markets. Foreign market production increased significantly during and immediately after World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

. In the following table (from Wright, 1930), the years 1905-1911 include Canadian output and the years 1912-1929 include both Canadian output and equipment built in railroad shops.

Locomotives Built in the USA 1896-1929

Year	Domestic	Foreign	Total
1896	866	309	1175
1897	865	386	1251
1898	1321	554	1875
1899	1951	514	2465
1900	2648	505	3153
1901	-	-	3384
1902	-	-	4070
1903	-	-	5152
1904	-	-	3441
1905	4896	595	5491
1906	6232	720	6952
1907	6564	798	7362
1908	1886	456	2342
1909	2596	291	2887
1910	4441	314	4755
1911	3143	387	3530
1912	4403	512	4915
1913	4561	771	5332
1914	1962	273	2235
1915	1250	835	2085
1916	2708	1367	4075
1917	2585	2861	5446
1918	3668	2807	6475
1919	2162	1110	3272
1920	2022	1650	3672
1921	1185	638	1823
1922	1303	231	1534
1923	3505	280	3785
1924	1810	226	2036
1925	994	291	1285
1926	1585	185	1770
1927	1009	167	1176
1928	636	111	747
1929	1022	139	1161

Total Production

The middle of the 20th Century marked the end of large commercial production of steam locomotives in North America. Estimates of total production can be broken down into two time periods based on the period before and after the creation of American Locomotive Company

American Locomotive Company

The American Locomotive Company, often shortened to ALCO or Alco , was a builder of railroad locomotives in the United States.-Early history:...

 in 1901. The following table provides a summary of this production and in some cases represents estimates rather than precisely known values (Bruce, 1952). A detailed list of manufacturers shows many of the larger producers.

Summary of Steam Locomotives Built in the USA 1831-1950

Class of Builder	Prior to 1901	1901-1950	Total
30 Builders of more than 100 units each	61520	99130	160650
63 Builders of less than 100 units each	1350	0	1350
70 Railroad Company-Shop Builders	7130	5870	13000
Total Production	70000	105000	175000