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The following are the most prevalent Norfolk Southern heavy diesel locomotives in use as of 2021, summarized from Chris Toth's excellent Norfolk Southern Diesel Locomotive Roster.

Rough Quantity Notes HO Model

725

-

9915The GE Dash 9-44CW is a 4,400 hp road switcher diesel-electric locomotive. Keeping in tradition with GE's locomotive series nicknames beginning with the "Dash 7" of the 1970s, the C44-9W was dubbed the "Dash 9" upon its debut in 1993.

Originally rated at 4,000 hp re-rated to 4,400 hp in 2013–2014.

The railroad plans to upgrade all of its Dash 9–40CW units to AC44C6M.

ScaleTrains.com

Athearn Genesis

InterMountain

400

+

 4278The GE AC44C6M is a 4,400-horsepower diesel locomotive that was built by GE Transportation Systems, and rebuilt by GE, American Motive Power, Inc., and Norfolk Southern's Juniata and Roanoke Shops, starting in September 2015. The AC44C6M retains the 16-cylinder 7FDL-16 prime mover used in the core locomotive prior to rebuilding, but features GE's alternating current 5GEB13B7 traction motors. Externally, the rebuilds have received new wide-nosed cabs and a new front hood section of the same design as on the ES44AC, while retaining the underframe and engine and radiator compartments of the original Dash 9 units. Internally, AC44C6M features a new under-floor air conditioner, cab signals, LSL, DPU systems, PTC, and ECP braking ability, a significant technological improvement from the GE Dash 9-40C units.

Norfolk Southern Railway (NS) is a significant operator of this model. All 124 of their remaining Dash 9-40C units, numbered 8764–8888 (excluding 8798, which was wrecked in 2018) were rebuilt from 2015 to 2018 and numbered 4000-4124.

The railroad plans to also upgrade all of its Dash 9–40CW units to the same standard.

4000-4005 painted in special DC to AC traction paint schemes (see below).

Athearn Genesis (including DC to AC scheme) 

Likely to come from ScaleTrains.com.

225

 1036The EMD SD70ACe is the successor to the SD70MAC with design changes to comply with emission standards. The engine fires with 15% lower internal pressure to improve emissions and features fewer internal components in the inverter.

Units 1065-1074 are painted in special heritage schemes (see below).

Athearn Genesis (including Heritage schemes)

MTH tooling was acquired by ScaleTrains.com.

220 7647 The GE ES44DC (Evolution Series, 4400 HP, DC traction) replaced the Dash 9-44CW model in the General Electric catalogue.

Athearn Genesis

InterMountain 

185

4011The GE ES44AC GEVO (Evolution Series, 4400 HP, AC traction) replaced the AC4400CW model in the General Electric catalogue.

Units 8025, 8098-8105, and 8114 painted in special heritage schemes (see below).

ScaleTrains.com

Broadway Limited

Bachmann (including Heritage schemes)

InterMountain (including Heritage schemes) 

135  7035The EMD/NS SD60E are rebuilt SD60 units with NS-designed widenose and cab. Athearn Genesis (including "Honor Our Veterans" and "First Responders")

125

-

2702The EMD SD70M-2 is DC traction version of the SD70ACe, and is nearly identical to the SD70ACe. Production began in 2005.

All units are stored pending retirement/sale/disposition.

Athearn Genesis

110

-

 7320The EMD SD70ACU was first built by EMD and later rebuilt by Norfolk Southern. It is originally an SD90MAC (or better known as a SD9043MAC) that has been rebuilt to renew its electrical components and replace the cab with the new EMD Phase-II cab to comply with the most recent safety requirements.

Many units pending retirement/sale/disposition.

Athearn Genesis

80

+

3621The GE ET44AC Tier 4 GEVO (Evolution Series Tier 4, 4400 HP, AC traction) replaces the ES44AC model.

ScaleTrains.com
(3677 on order)

InterMountain 

NOTES:

  • All EMD SD80MAC were sold in February 2020.
  • All EMD SD90MAC have been rebuilt as SD70ACU.