Southern Pacific No. 7503

Southern Pacific No. 7503 was an EMD SD45R diesel locomotive built by the Electro-Motive Division for the Southern Pacific Railroad in 1967.
==History==
Southern Pacific No. 7503 was built in 1967 and entered service on the Southern Pacific Railroad the same year in 1967.
When it was first built, it was first built as SD45 #8917 and given the classification of EF636-2, but due to the massive 20-cylinder engines causing them to have a very bad fuel mileage and coupled with the crankshaft failures, it was rebuilt into an EMD SD45R and renumbered from 8917 to 7503 in 1984, it would be reclassified by the Southern Pacific as EF636LR-1.
It had lasted into the days of Union Pacific when Southern Pacific and its parent company Rio Grande Industries had merged into Union Pacific. It would be retired from service on the Union Pacific in 1999 and was eventually rebuilt into a CEFX SD40M-2 and renumbered by CEFX #3134. In 2014, the Maryland Midland Railroad (Parent company Genesee & Wyoming) purchased 3134 from CEFX and was renumbered 3449. Sometime in mid-2014, it was repainted into corporate colors.
Category:EMD SD45R
Category:EMD SD45
Category:Southern Pacific locomotives
Category:Locomotives
Category:Diesel locomotives
Category:4 foot 8 1⁄2 inch gauge
Category:Standard gauge locomotives
Category:Built in 1967
Category:Six-axled diesel locomotives
Category:United States
Category:Freight locomotives
Category:Standard gauge locomotives of the United States
Category:Diesel-electric locomotives
Category:Union Pacific
Category:Union Pacific locomotives
Category:EMD locomotives
Category:American locomotives
Category:Southern Pacific Class EF636LR-1
Category:Locomotives involved in Rebuilds
Category:Southern Pacific Class EF636-2
Category:American diesel locomotives
Category:C-C locomotives