Athearn ATH7336 SD70, UP #2223, N Scale

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Road Number Will Be #2223
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Detailed Information


  • See-through cab windows
  • Factory installed Celcon handrails
  • 5-pole motor with precision-machined flywheels and multi-link drive train
    for trouble free operation
  • DCC Ready
  • Illuminated front and rear headlights
  • Nickel plated, blackened machined wheels
  • Wheel contours operate on all popular brand of track
  • Replacement parts available


Continuing upon the successful SD60-series, in 1992 EMD debuted the next step in
locomotive evolution with the SD70. While outwardly similar at first glance to
the SD60, the D.C.-drive SD70 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 EMDs 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 EMDs 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

Continuing with previous practice, EMD built a set of Demonstrator SD70Ms, EMD
7000-7002, all equipped with the North American safety-cab (hence the M in
their model designation), and decked out in an attractive gray, silver, and
burgundy paint scheme. These units travelled all over North America, showing off
the latest technology from EMD. Eastern giant Norfolk Southern liked what it
saw, and was the first to order SD70s, but with a twist; instead of having them
equipped with the increasingly popular (and soon to be standard) M cab, they
opted for standard, or Spartan cabs on their initial orders. The first
production SD70s, NS 2501-2506, built in 1993, were quickly followed by
additional units; NS 2507-2531, also built in 1993, and NS 2532-2556, built in
1994. They could be found in a variety of assignments over the NS system, and
even saw run-through service on connecting roads, such as Southern Pacific,
making appearances on the West Coast.


Minimum Age Recommendation:
14 years
Is Assembly Required:

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