EMD® 20B Repower

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The EMD® 20B is an EMD® GP style locomotive powered with a Cat® 3512C HD Engine and Kato Alternator. It was designed with flexibility in mind, allowing customers to choose options without extensive Engineering. It is constructed with a New Crashworthy Underframe, Cab and Fuel Tank and utilizes rebuilt GP style trucks with rebuilt D78 Traction Motors.


  • Reliable and fuel-efficient Cat® 3512C HD 2000 HP Engine
  • New HVC with Zeit SAL V Locomotive Control System
  • Offered with a 2-year warranty for new content
  • New Atlas Copco Rotary Screw Air Compressor
  • New PRS Crashworthy Event Recorder with LDVR
  • Control system EM2000™ including AESS™
  • PR Uptime optional


Technical Details


Locomotive Model:
Cat® Powered GP
Engine Model:
Cat® 3512C HD
Brake Horsepower:
No. of Cylinders:
Low Idle Speed RPM:
Full Speed:
Exhaust Aftertreatment Type:
Emissions Certification:
US EPA Tier 3 and Tier 4* Switch
Mech. Bonded
Traction Alternator:
Kato – 1530 kW
Companion Alternator:
Kato – 250kW
Air Compressor:
Atlas Copco GAR 37

Engine Information

3512C HD Engine

  • Caterpillar has produced over 170,000 of its 3500 series engines since 1980.
  • A decrease in Fuel Consumption of up to 15% from a typical GP38-2.
  • Oil Change interval can be extended to 368 days from 184 days with proper oil sampling.
  • Fully integrated Engine and Aftertreatment protection by Zeit SALV control system and the Engine ECM.
  • Demonstrated Engine System reliability (includes engine and aftertreatment)
  • Supported by Progress Rail and your Local Cat® Dealer.