Description
Continuing upon the successful SD60-series, in 1992 EMD debuted the next step in locomotive evolution with the SD70-series. While outwardly similar at first glance to the SD60M, the D.C.-drive SD70M featured several external design refinements from the predecessor model. Battery boxes were relocated to the left-hand side walkway immediately behind the cab, a large, boxy forward traction motor blower housing replaced the angular version used on SD60s, the raised walkway duct on the left hand walkway was eliminated, and an intake for the rear traction motor blower on the left hand side of the carbody, directly under the rear radiator intake grill, was added.
Internally, the SD70 boasted improvements as well; a 16-710GB prime mover, rated at 4,000hp, was coupled to a new alternator design, the AR20. New D70TR traction motors were standard, and controlling all of this power and locomotive function was EMD’s new EM2000 microprocessor, which boasted more memory, twice the processing speed, and improved locomotive self-diagnostic capabilities compared to the processor suite used in the SD60. Even more revolutionary was the inclusion of EMD’s patented “Radial” truck design, the HTC-R. This design, which made its debut under EMD Demo SD60 #3, replaced the venerable HT-C truck, and is unique in its ability to shift, or “steer”, the wheelsets laterally through curves, resulting in greatly reduced wheelset and track wear, and coupled with the new D70TR traction motors and EM2000 microprocessor, greatly improved adhesion. Internally, the SD70 boasted improvements as well; a 16-710GB prime mover, rated at 4,000hp, was coupled to a new alternator design, the AR20. New D70TR traction motors were standard, and controlling all of this power and locomotive function was EMD’s new EM2000 microprocessor, which boasted more memory, twice the processing speed, and improved locomotive self-diagnostic capabilities compared to the processor suite used in the SD60. Even more revolutionary was the inclusion of EMD’s patented “Radial” truck design, the HTC-R. This design, which made its debut under EMD Demo SD60 #3, replaced the venerable HT-C truck, and is unique in its ability to shift, or “steer”, the wheelsets laterally through curves, resulting in greatly reduced wheelset and track wear, and coupled with the new D70TR traction motors and EM2000 microprocessor, greatly improved adhesion.
BNSF FEATURES: BNSF FEATURES:
Faded paint colors Faded paint colors
Small EMD plow Small EMD plow
Round deck mounted front ditch lights Round deck mounted front ditch lights
Large Sinclair antenna Large Sinclair antenna
Early EMD trucks with hidden bearings Early EMD trucks with hidden bearings
Road number specific details and artwork Road number specific details and artwork
Part of the original Santa Fe 1994 order, these SD75M’s are depicted as late in their life. Just before they were sold to PRLX, they soldered on looking beaten and battered, but still earning revenue for their owner. Renumbered to the 8200 class in the 2000s, they eventually returned back to their original Santa Fe numbers again, but with Burlington Northern Santa Fe patches. Part of the original Santa Fe 1994 order, these SD75M’s are depicted as late in their life. Just before they were sold to PRLX, they soldered on looking beaten and battered, but still earning revenue for their owner. Renumbered to the 8200 class in the 2000s, they eventually returned back to their original Santa Fe numbers again, but with Burlington Northern Santa Fe patches.
ROAD NUMBER SPECIFIC FEATURES: ROAD NUMBER SPECIFIC FEATURES:
#226 #226
Ex-ATSF #226 Ex-ATSF #226
Small cab numbers Small cab numbers
Added rear number boards Added rear number boards
Yellow frame stripes Yellow frame stripes
#231 #231
Ex-ATSF #231 & 249 Ex-ATSF #231 & 249
Large cab numbers Large cab numbers
Yellow frame stripes Yellow frame stripes
SD70 SERIES LOCOMOTIVE FEATURES: SD70 SERIES LOCOMOTIVE FEATURES:
Coupler cut levers Coupler cut levers
Flexible Trainline and MU hoses Flexible Trainline and MU hoses
MU stands MU stands
Windshield wipers Windshield wipers
Lift rings Lift rings
Wire grab irons Wire grab irons
Walkway tread Walkway tread
Sanding lines Sanding lines
Lit signal lights and/or beacons, if equipped Lit signal lights and/or beacons, if equipped
Detailed fuel tank with fuel fillers, fuel gauges, and breather pipes Detailed fuel tank with fuel fillers, fuel gauges, and breather pipes
Speed recorder unless noted Speed recorder unless noted
EMD HTCR trucks, early with hidden bearings, or late with exposed bearings per prototype EMD HTCR trucks, early with hidden bearings, or late with exposed bearings per prototype
See-through cab windows and full cab interior See-through cab windows and full cab interior
Fine-scale Celcon handrails for scale appearance Fine-scale Celcon handrails for scale appearance
Body-mounted McHenry scale knuckle couplers – Kadee compatible Body-mounted McHenry scale knuckle couplers – Kadee compatible
DCC-ready features Quick Plug plug-and-play technology with 21-pin NEM connector DCC-ready features Quick Plug plug-and-play technology with 21-pin NEM connector
Scaled from prototype resources including drawings, field measurements, photographs, and more Scaled from prototype resources including drawings, field measurements, photographs, and more
Accurately painted and printed paint schemes Accurately painted and printed paint schemes
Genesis driveline with 5-pole skew wound motor, precision machined flywheels, and multi-link drivetrain Genesis driveline with 5-pole skew wound motor, precision machined flywheels, and multi-link drivetrain
All-wheel drive with precision gears for smooth & quiet operation All-wheel drive with precision gears for smooth & quiet operation
All-wheel electrical pickup provides reliable current flow All-wheel electrical pickup provides reliable current flow
Wheels with RP25 contours operate on all popular brands of track Wheels with RP25 contours operate on all popular brands of track
LED lighting for realistic appearance LED lighting for realistic appearance
Heavy die-cast frame for greater traction and more pulling power Heavy die-cast frame for greater traction and more pulling power
Minimum radius: 18″ – Recommended radius: 22″ Minimum radius: 18″ – Recommended radius: 22″
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