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Class I Railroad Locomotive Fleet by Year Built
a Disregards year of rebuilding.
b Included in 1970-74 category.
c Includes all locomotives built before 1975.
d Includes locomotives built between 1990-94.
e Included in 1990 category.
f Included in 1975-79 category.
g Includes all locomotives built before 1980.
h Includes locomotives built between 1995-99.
i Included in 1995 category.
j Included in 1980-84 category.
k Includes all locomotives built before 1985.
l Includes locomotives built between 2000-04.
m Included in 2000 category.
n Included in 1990 category.
o Includes all locomotives built before 1990.
p Includes locomotives built between 2005-09.
q Included in 2005 category.
Association of American Railroads, Railroad Facts (Washington, DC: Annual Issues) p. 52 and similar pages in earlier editions.