Southern Pacific No. 7503

Southern Pacific No. 7503
Southern Pacific No. 7503 at Abernethy, Oregon on September 7th, 1987.
Technical specifications
Serial number(s)	32831
Manufacturer(s)	Electro-Motive Division
Type of locomotive	Diesel-electric
Constructed	1967
Classification	EF636-3 (8917) EF636LR-1 (7503)
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Prime mover	EMD 16-645E3
Cylinders	20
Service information
Operator(s)	Southern Pacific Railroad Union Pacific Railroad CEFX
Fleet numbers	SP: 8917 7503 CEFX 3134
Preservation information
Disposition	Rebuilt into CEFX SD40M-2 #3134.

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.