EMD GP33ECO
EMD GP33ECO Norfolk Southern 4722 powers a freight train, with a RP-M4C at the lead. This unit was later renumbered to 6722.
Type and origin Power type Diesel Builder Norfolk Southern Railway Build date 2014 Rebuilder Altoona Works Number rebuilt 30
Specifications Configuration: ​  • AAR B-B  • UIC Bo′Bo′ Gauge 4 ft 8+1⁄2 in (1,435 mm) Prime mover 12N-710G3B-T3 RPM range 900-950 Engine type diesel Aspiration Turbocharged Displacement 8520 cu in Alternator AR15CA6-D14 Traction motors 4 D87B Cylinders 12 Cylinder size 710 cu in Transmission electric MU working AAR Loco brake pneumatic, dynamic
Performance figures Power output 3,000 horsepower (2,200 kW) (software limited)[1] Tractive effort 64,200 lbs
Career Numbers 6700-6729 (formerly 4700-4729) Current owner Norfolk Southern Disposition Renumbered to 6700 series locomotives to clear the roster for new rebuilt AC44C6Ms
[2]

The EMD GP33ECO is a 4-axle diesel-electric locomotive built by the Norfolk Southern Railway in its Juniata Locomotive Shop. The locomotive is a rebuild of the EMD GP50 designed to meet Tier 3 emissions standards. The first locomotive was completed in January 2015. The rebuild was funded in part by the federal Congestion Mitigation and Air Quality Improvement Program.^[3]

• Guss, Chris (March 2016). "Green is the new black". Trains. 76 (3).

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