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

^l Includes locomotives built between 2000-04.

^m Included in 2000 category.

ⁿ Included in 1985-89 category.

^o Includes all locomotives built before 1990.

^p Includes locomotives built between 2005-09.

^q Included in 2005 category.

^r Includes all locomotives built before 1995.

^s Included in 1994 category.

^t Includes locomotives built between 2010-14.

^u Included in 2010 category.