Two RP18GPs zip through Chicago Heights likely on their way towards Dolton Junction. Photo Credit: Robby Gragg

The RP18GP can be somewhat considered as a spiritual successor to the RP20BD, or Phase III of the RP20BD. Take your pick. These engines were introduced in 2015 following EPA Tier 4 Emissions standards coming into effect. As Deutz AG did not offer a Tier 4 engine at the time, these engines were instead powered by derated QSK19s, the only Railpower locomotives on a Class I to be powered by such. UP was the only buyer of this model with 14 rebuilt by sending in GP15-1 cores, and surprisingly enough, as of July 2024, they are still in service, being the last gensets on a Class I. They are currently stationed in the Chicago Region in Dolton, Illinois.

Technical Specifications

General Info	-
Prime Mover	Cummins QSK19R
Horsepower	1800
Truck Type	Blomberg B
Axles	4
Traction Motors	4
Minimum Weight	240,000 lbs (1)
Maximum Weight	285,000 lbs (1)
Model Base Speed	65 MPH (1)
Top Speed	50, 65, 71, 77, 83, or 89 MPH (1)

Electrical System	-
Generator Max Current	855 Amps (2)
Max TM Current	2350 Amps (1)
Max Continuous TM Current	920 Amps (1)
Traction Motor Type	DC
Adhesion	25%
Transition Mode	Automatic with no Selector
Transition Groups	1 (1)
Transition Shunts	1 (1)
Generator Transition	Yes
Traction Control	ETC
Dynamic Braking Mode	Electronic Blowers
DB Max Current	700 Amps
DB Max Continuous Current	700 Amps
Blended Braking	No

Miscellaneous	-
Head-End Power (HEP)	you will not.
HEP Power Consumption	N/A
HEP Standby/Run Mode	N/A
Load Ramp Speed	5 Amps/Tick ⚠️
TM Overload Protection	No
Start Mode	Fully Automatic Start
Air Brake Schedule	26-L
Compressor CFM	159 (Atlas GAR37 @ 2750 RPM) (2)
Main Air Reservoir	35 Cubic Feet (1)⚠️

Notes:

(1): Dependent on the core unit (Specs shown are based on the GP15-1).

(2): Multiply this by 3, as these engines would have more than one generator and compressor. Hence the name "genset".