Available Items


O Gauge RailKing SD70ACe Imperial Diesel Engine With Proto-Sound 3.0
  • Norfolk Southern


O Gauge RailKing SD70ACe Imperial Diesel Engine With Proto-Sound 3.0
  • CSX


O Gauge RailKing SD70ACe Imperial Diesel Engine With Proto-Sound 3.0
  • Kansas City Southern


O Gauge RailKing SD70ACe Imperial Diesel Engine With Proto-Sound 3.0
  • BNSF


O Gauge RailKing SD70ACe Imperial Diesel Engine With Proto-Sound 3.0
  • Union Pacific

2024 O Gauge RailKing SD70ACe Diesel Locomotives Announced

January 2, 2024 - M.T.H. Electric Trains will be releasing the 2024 O Gauge RailKing Imperial SD70ACe Diesel Locomotive in five different liveries early next Summer. Each of these offerings will be available in limited quantities and is expected to begin shipping to M.T.H. Authorized Retailers in June 2024.

Check out each of the offerings in the list on the left.


In addition to the M.T.H. releases, you can find all the 2024 Custom Run models of the RailKing SD70ACe Diesel offerings that M.T.H. is producing for M.T.H. Authorized Retailers by going HERE.


By the turn of the 21st century, the diesel horsepower race was over. The third generation of freight engines had found its sweet spot: a six-axle, computer-assisted, 4000–4400 horsepower locomotive with a wide, comfortable cab. Railroads viewed this as the perfect building block for multi-engine lashups to power virtually any size train. Development of the next generation of power would be born not out of railroad needs, but due to government regulations.

On January 1, 2005, the Environmental Protection Agency’s Tier 2 emissions requirements for railroad locomotives went into effect, significantly reducing the pollutants that diesels could exhaust into the atmosphere. Electro-Motive Diesel’s SD70ACe, along with its General Electric rival, the ES44AC, inaugurated the fourth generation of diesel power in response to those regulations.

Rather than just upgrade its existing SD70MAC to Tier 2 standards, EMD took the opportunity to design a new locomotive from the rails up. Emissions turned out to be the easy part. Only slight modifications were needed to make EMD’s 4300 horsepower model 710 motor meet new emission standards. With 5000 such motors in service worldwide and a reputation for dependability, EMD reasoned that shop crews would prefer familiar technology.

Other than the prime mover, however, virtually every element of the SD70ACe was re-thought to create a 21st century locomotive. Ergonomics were a prime consideration. The engine’s angular nose offers the crew far better visibility than most other locomotives, and the cab is comfortable for engineers of almost any size. Digital screens provide a range of information on what is happening both inside the locomotive and out on the road. The cab easily accommodates a crew of three — an important factor in a modern world without cabooses.

The SD70ACe also offers, in EMD’s words, “outstanding improvements in maintainability.” All electrical wires are on the right side of the locomotive and all piping is on the left, with most pipes and wires routed under the frame so they can be serviced by a man standing outside the engine — rather than crawling around at the bottom of the engine room.

After a year of testing on the road and at the Association of American Railroads’ test track in Pueblo, CO, the first SD70ACe’s (‘e” stands for “enhanced”) were delivered to CSX Transportation in 2004. Six of North America’s seven major Class 1 railroads, along with a number of smaller lines, ponied up to buy the new locomotives. When stricter Tier 3 emissions rules went into effect in 2012, compliance was relatively easy. By the end of production in 2014 — after new Tier 4 requirements dictated a new locomotive design — nearly 2000 SD70ACe’s were and still are hauling freight across the U.S., Canada and Mexico.

Check out each of the offerings in the list on the left.

Product Features

  • Intricately Detailed, Durable ABS Body
  • Die-Cast Truck Sides, Pilots and Fuel Tank
  • Metal Chassis
  • Metal Handrails and Horn
  • Detachable Snow Plow
  • (2) Handpainted Engineer Cab Figures
  • Authentic Paint Scheme
  • Metal Wheels, Axles and Gears
  • (2) Remote-Controlled Proto-Couplers
  • Prototypical Rule 17 Lighting
  • Directionally Controlled Constant Voltage LED Headlights
  • Lighted LED Cab Interior Light
  • Illuminated LED Number Boards
  • (2) Precision Flywheel-Equipped Motors
  • Operating ProtoSmoke Diesel Exhaust
  • Onboard DCC/DCS Decoder
  • Locomotive Speed Control In Scale MPH Increments
  • Near Scale Sizing
  • Proto-Sound 3.0 With The Digital Command System Featuring Freight Yard Proto-Effects
  • Unit Measures: 17” x 2 1/2” x 3 3/4”
  • Operates On O-31 Curves Diesel DCC Features
  • F0 Head/Tail light
  • F1 Bell
  • F2 Horn
  • F3 Start-up/Shut-down
  • F4 PFA
  • F5 Lights (except head/tail)
  • F6 Master Volume
  • F7 Front Coupler
  • F8 Rear Coupler
  • F9 Forward Signal
  • F10 Reverse Signal
  • F11 Grade Crossing
  • F12 Smoke On/Off
  • F13 Smoke Volume
  • F14 Idle Sequence 3
  • F15 Idle Sequence 2
  • F16 Idle Sequence 1
  • F17 Extended Start-up
  • F18 Extended Shut-down
  • F19 Rev Up
  • F20 Rev Down
  • F21 One Shot Doppler
  • F22 Coupler Slack
  • F23 Coupler Close
  • F24 Single Horn Blast
  • F25 Engine Sounds
  • F26 Brake Sounds
  • F27 Cab Chatter
  • F28 Feature Reset