The EMD GP series locomotives became some of the most successful designs of the age. Produced from 1970s to mid 1980s the GP38-2 and GP50 were quickly found in many different tasks of the railroad. From switching to pulling high priority freight trains across country, these versatile locomotives brought the goods to North America. Many of these locomotives are now being rebuilt with ecologically sound emission control for higher population centers. A new era emerges as technology meets proven reliability for these EMD products.

The GP33ECO is the result of a Norfolk Southern rebuilding program in the Juniata Shops that coverted GP50's to provide additional service life, better fuel economy and lower emissions.

Prototype Improvements Made:

• EM2000 microprocessor installed, including all new electrical cabinet, SmartStart auto start/stop, and layover equipment
  
• 16-645 engine replaced with a 12N-710G3B-T3 (tier 3)
  
• AR15CA6-D14 main alternator and companion generator installed with D87B traction motors
  
• Original long hood retained with addition of flared radiator similar to phase 2 SD70M
  
• Changed from long hood forward to short hood forward with Admiral cab
  
• Setup to operate with RP-M4C road slugs
  
• EMDEC Electronic Unit Injection (EUI) system
  
• CCB26 electronic air brake and 6 cylinder WLAGA9A air compressor
  
• Not equipped with cab signaling