QSK95 for Rail

Power 4000 - 4400 hp
2983 - 3281 kW
Torque 11671 - 12838 lb-ft
15824 - 17406 N•m
Certification Tier 4 Final / Stage IIIB

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The Path to Zero in Passenger





  • train equipped with qsk95 enginePercentages listed above represent the emission reductions from tier 0 to tier 4 as a result of the QSK95
  • 92 units in revenue service 
  • 17.7M miles (and counting)
  • Over 1.1M hours  
  • CO2 savings of 380 Metric Tons per locomotive per year compared to the engine its replacing 
  • Equivalent to taking 81 passenger cars taken off the road
  • EPA's Greenhouse Gas Equivalencies Calculator


Base engine without aftertreatment
Horsepower 3,600-4,400 hp / 2,685-3,281 kW
Governed Speed 1,800 rpm
Displacement 5,797 cu in / 95 L
Bore and Stroke 7.5 x 8.25 in / 191 x 210 mm
Number of cylinders 16
Dry weight 29,300 lb / 13,290 kg
Length 145 in / 368 cm
Width 65 in / 165 cm
Height 95 in / 241 cm


  Rated power hp (kW) @ rpm
QSK95 4,400 (3,281) @1,800
4,200 (3,132) @ 1,800
4,000 (2,983) @ 1,800


  • Superior Power Density: The QSK95 produces up to 4,400 hp at 1,800 rpms with only 16 cylinders. Four fewer cylinders than other high-speed locomotive engines gives the QSK95 better reliability with fewer moving parts. 
  • Advanced Power Cylinder Design: This technology reduces the amount of cylinder wear, provides better breathing and thermal stresses, bringing together high-speed efficiency with durability.
  • Modular Common Rail Fuel System (MRS): This system maintains high injection pressures regardless of engine speed for exceptional performance at every rpm. Compared to unit injection systems, it provides improved response and load pickup with lower noise and vibration.  
  • Quad Single-Stage Turbochargers: Four compact turbochargers deliver best in-class clean acceleration, tight packaging, excellent serviceability and unmatched cost-effectiveness 
  • Meets Tier 4 and Stage 5 Emissions Requirements: The QSK’s compact size provides room for a proven, simplistic selective catalytic reduction (or SCR) system instead of an exhaust gas recirculation system. Using the SCR system allows the QSK95 to meet Tier 4 and Stage 5 emissions requirements, operate at lower temperatures, use a smaller cooling system and provide better fuel economy with fluid savings of 5-7% compared to other Tier 4 solutions. 
  • Two-stage Aftercooling: Two-stage aftercooling provides a better-balanced cooling system that considerably reduces radiator sizing and cost. Tier 4/Stage IIIB engines will have heat rejection similar to Tier 3/Stage IIIA engines. 
  • Eliminator Oil Filtration: A highly efficient combination of self-cleaning micromesh filters and twin centrifuges enables the QSK95 to achieve industry-demanded extended service intervals. 
  • PrevenTech Engine Monitoring: Using advanced engine monitoring, analytics and prognostics, data is analyzed remotely to evaluate performance and identify potential issues which are reported back to customers through alter notifications. PrevenTech offers your locomotives experience extended service intervals, reduced repair times and maximum uptime.
  • 184-Day Service Intervals: The QSK95 can meet the service schedules of both high-speed and medium-speed rail.  

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