While the U25B was a venerable locomotive, it can't outlast God, no locomotive can. In 1977, Southern Pacific had some written off U25Bs sitting around and wanted to experiment with them, because it's not SP without fucking the Central California Traction over experimenting with their motive power. So in 1977, Morrison-Knudsen rebuilt four SP U25Bs to run on Sulzer prime movers. To accomplish this, the hood was widened 4 inches and raised up 10 inches for the prime mover. This resulted in U25Bs that loosely resembled GP30s. 50 U25Bs were planned for this rebuild, if only it worked. Yes, because the Sulzer primer was rather stressed to its limit, failures were frequent. The cost of rebuilding the U25s into TE70-4Ss also outweighed the benefits. The units were retired in 1986 and stored in Eugene, Oregon, later sent to a scrapyard in Oakland, California. There were attempts to buy the TE70s for preservation, but this failed, and all 4 units were scrapped by 2008.

Technical Specifications

General Info	-
Prime Mover	Sulzer 12ASV 25/30
Horsepower	2800
Truck Type	AAR Type B
Axles	4
Traction Motors	4
Minimum Weight	260,000 lbs
Maximum Weight	272,000 lbs
Model Base Speed	65 MPH
Top Speed	85 MPH

Electrical System	-
Generator Max Current	3000 Amps
Max TM Current	1500 Amps
Max Continuous TM Current	1085 Amps
Traction Motor Type	DC
Adhesion	25%
Transition Mode	Automatic with Selector
Transition Groups	2, 2, 1, 1
Transition Shunts	1, 0.55, 1, 0.55
Generator Transition	No
Traction Control	APR
Dynamic Braking Mode	Mechanical Blowers
DB Max Current	740 Amps
DB Max Continuous Current	740 Amps
Blended Braking	No

Miscellaneous	-
Head-End Power (HEP)	uhh. N O.
HEP Power Consumption	N/A
HEP Standby/Run Mode	N/A
Load Ramp Speed	8 Amps/Tick ⚠️
TM Overload Protection	No
Start Mode	Fully Automatic Start
Air Brake Schedule	26-L
Compressor CFM	307 (WABCO 3CDCBL @ 1000 RPM) ⚠️
Main Air Reservoir	32.4 Cubic Feet ⚠️