Uncataloged 2026 O Scale Premier SD45T-2 Tunnel Motor Diesel Locomotive Announced

March 9, 2026 - M.T.H. Electric Trains has announced an exclusive and uncataloged Premier O Scale SD45T-2 Tunnel Motor Diesel Locomotive in Duluth, Missabe & Iron Range livery for M.T.H. Authorized Retailer Mr. Muffin's Trains in Atlanta, Indiana. The locomotive will be offered in two unique cab numbers, both in extremely limited quantities beginning in June 2026.

Item No. 20-22182-1 Duluth, Missabe & Iron Range SD45T-2 Tunnel Motor Diesel Engine w/Proto-Sound 3.0 (Hi-Rail Wheels)
Cab No. 403
Early Order Price: $599.95 (plus freight)
Click HERE to order from Mr. Muffins.

Item No. 20-22183-1 Duluth, Missabe & Iron Range SD45T-2 Tunnel Motor Diesel Engine w/Proto-Sound 3.0 (Hi-Rail Wheels)
Cab No. 407
Early Order Price: $599.95 (plus freight)
Click HERE to order from Mr. Muffins.

ABOUT THE PREMIER O SCALE SD40T-2 TUNNEL MOTOR

If railroads had diseases, the Southern Pacific would have been diagnosed with asthma. The combination of high altitudes and numerous tunnels and snow sheds (tunnel-like sheds that protect track from snowfalls and avalanches) on its mountain divisions caused perennial breathing problems for SP locomotives and crews. In the steam era, this led to the development of cab-forward articulateds that allowed crew members to breathe tunnel air before the locomotive had polluted it. In the diesel era, the solution was the Tunnel Motor.

In a normal diesel locomotive, cooling air for the radiators is taken in near the top of the car body. In a long tunnel, however, hot engine exhaust and heated air from the radiators collects at the top of the tunnel. This hot air is taken into the radiators and cannot cool the engine sufficiently. In a multiple-unit diesel lashup, the result is that trailing units may overheat and automatically shut down. In a worst-case situation, the extra load will cause the overworked lead units to fail and leave the crew stranded in the tunnel. Electro-Motive’s answer for the Southern Pacific was a modification of its SD45, with the air intakes moved lower on the engine so they could take in cooler air. Extra-large radiators were placed on the roof of the engine, with the fans located below them to blow cooler air up from below.

The first SD45T-2 Tunnel Motors were delivered in February 1972, and were among the first "Dash-2" versions of EMD’s muscular 20-cylinder, 3600 hp freighter. Responding to complaints of crankshaft and bearing failures on earlier SD45s, EMD had beefed up its model 645 diesel motor. Perhaps more important, the Dash-2 series’ introduction of solid-state electronics ushered in the third generation of diesel technology. Transistors and circuit boards replaced the massive switches, contacts, interlocks, and relays of earlier diesels, making possible a range of innovations that would make life easier for diesel engineers in coming years.

• Intricately Detailed, Durable ABS Body
• Die-Cast Truck Sides, Pilots and Fuel Tank
• Metal Chassis
• Metal Handrails and Horn
• Moveable Roof Fans
• Metal Body Side Grilles
• Detachable Snow Plow
• (2) Handpainted Engineer Cab Figures
• Authentic Paint Scheme
• Metal Wheels, Axles and Gears
• (2) Remote-Controlled Proto-Couplers
• O Scale Kadee-Compatible Coupler Mounting Pads
• 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
• Proto-Scale 3-2 3-Rail/2-Rail Conversion Capable
• 1:48 Scale Proportions
• Proto-Sound 3.0 With The Digital Command System Featuring Quillable Horn With Freight Yard Proto-Effects
• Unit Measures: 18 5/8" 2 9/16" x 4"
• Operates On O-42 Curves

Order directly from:

Mr. Muffin's Trains
165 E. Main St.
Atlanta, IN 46031
765-292-2022
Email: mrmuffin@mrmuffinstrains.com
www.mrmuffinstrains.com

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