SD60MAC - MagnumMacKivler/RLCPT2 GitHub Wiki
Burlington Northern SD60MAC 9501 sits at the Denver, Colorado diesel shops on a winter's day in February of 1993. Photo credit Greg Thompson
The SD60MAC was an experimental AC locomotive created by EMD by using the SD60 design. The SD60MACs were the first locomotives within EMD's offerings to use alternating current traction motors, and used the newly developed HTC Radial steering truck.
Only four examples were made of this locomotive; all were units made for the Burlington Northern railroad in June of 1991 (BN 9500 & 9501) and January of 1992 (9503 & 9504). The SD60MAC locomotives were primarily tested on Burlington Northern's coal trains from the Powder River Basin, where long and slow coal trains could benefit from less fast, but more powerful AC powered locomotives. Eventually, the SD60MACs would later give up their job to the SD70MAC locomotive types, a group that the 60MAC tests helped to develop.
After the successful test of the new AC traction setups, the SD60MACs were later considered too unique to justify further use, and Burlington Northern returned the locomotives to Electo-Motive Division.
The 9501 became a test bed for diesel engines to either wear them in before installations into EMD locomotives, or to try out experimental engine designs.
Test bed locomotive SD60MAC 7501 sits with hood open with a motor subject to break-in or experiments at EMD's plant in LaGrange, Illinois in 2012. Photo credit Richard Rosinsk
The other three locomotives (9500, 9502, & 9503) are currently being used at the Association of American Railroads (AAR) and Federal Railroad Administration (FRA) testing grounds out at Pueblo, Colorado for either locomotive power on test trains, or are otherwise in storage to an uncertain future.
SD60MACs 9500, 9502, and 9503 (still in BN paint with a few patches) with EMD SDP40F 169 are on a test train experimenting with the new SD70ACe design in Pueblo, Colorado in 2007. Photo credit Eric Daly
PT-Specific Information
| General Info | - |
|---|---|
| Prime Mover | EMD 16-710G3B |
| Horsepower | 4000 |
| Truck Type | EMD HTCR |
| Axles | 6 |
| Traction Motors | 6 |
| Minimum Weight | 410,000 lbs ⚠ |
| Maximum Weight | 430,000 lbs ⚠ |
| Model Base Speed | 74 MPH |
| Top Speed | 74, 80, 86, and 92 MPH ⚠ |
| Electrical System | - |
|---|---|
| Generator Max Current | 4530 Amps (1) |
| Max Traction Motor (TM) Current | 755 Amps (1) |
| Max Continuous TM Current | 755 Amps (1) |
| Traction Motor Type | AC |
| Factor of Adhesion | 32% |
| Transition Mode | Automatic, no Selector |
| Transition Groups | 1 |
| Transition Shunts | 1 |
| Generator Transition | No |
| Traction Control | ETC |
| Dynamic Braking (DB) Mode | Electrical Blowers |
| DB Max Current | 755 Amps ⚠ |
| DB Max Continuous Current | 755 Amps ⚠ |
| Blended Braking | No |
| Miscellaneous | - |
|---|---|
| Head-End Power (HEP) | No |
| HEP Power Consumption | N/A |
| HEP Standby/Run Mode | N/A |
| Load Ramp Speed | 1 Amps/Tick |
| TM Overload Protection | N/A |
| Starter Mode | Manual Primer, Manual Start |
| Air Brake Schedule | 26L |
| Compressor CFM | 254 (Gardner Denver WBO @ 900 RPM) |
| Main Reservoir Volume | 33.8 Cubic Feet ⚠ |
###Notes:
⚠: Not verified or educated guess
(1): AC electrical gear is three-phase. Value shown here is for a single phase; the value used by RLC PT2 should be 3 times the value shown.