The EMD GP15-1 is a 4-axle diesel-electric locomotive built by General Motors Electro-Motive Division between June 1976 and March 1982. Intended to provide an alternative to the rebuilding programs that many railroads were applying to their early road switchers, it is generally employed as a yard switcher or light road switcher. This locomotive is powered by a 12-cylinder EMD 645E engine, which generates 1,500 hp (1,119 kW). The GP15-1 uses a 50-foot-9-inch (15.47 m) frame, has a wheelbase of 29 ft 9 in (9.07 m) and has a length over couplers of 54 ft 11 in (16.74 m). A total of 310 units were built for American railroads. A number of GP15-1s remain in service today for yard work and light road duty. The radiator section is similar to those found on the EMD SD40T-2 and EMD SD45T-2 "tunnel motors," leading some observers to incorrectly identify the units as such or as GP15Ts, and giving them the nickname "baby tunnel motors".[1]

This article includes a list of general references, but it lacks sufficient corresponding inline citations. (March 2017)

EMD GP15-1
Union Pacific Yard (UPY) 742, a GP15-1 idles in Union Pacific's Global 1 intermodal yard in Chicago, IL.
Type and origin Power type Diesel-electric Builder General Motors Electro-Motive Division (EMD) Model GP15-1 Build date June 1976 – March 1982 Total produced 310
Specifications Configuration: ​  • AAR B-B Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Length 54 ft 11 in (16.74 m) Loco weight 246,000 lb (111,600 kg) Fuel capacity 2,400 imp gal (11,000 l; 2,900 US gal) Prime mover EMD 645E Engine type V12 2-stroke diesel Aspiration Roots blower Displacement 7,740 cu in (126.8 L) Cylinders 12 Cylinder size 9.1 in × 10 in (231 mm × 254 mm) Transmission diesel electric Loco brake Straight air Train brakes 26-L air
Performance figures Power output 1,500 hp (1,100 kW) Tractive effort 47,000 lbf (210 kN)
Career Locale United States

Original Owners

Missouri Pacific Railroad

The Missouri Pacific Railroad purchased more units than the other three buyers combined. For spotting purposes, the MP models have a number of visually distinguishing features, though not all were applied consistently to the MP units:

• The MP units have a grab iron ladder mounted on both sides of the long hood end;
• MP's initial order of GP15-1s rode on Blomberg M trucks rather than the more common Blomberg B (all subsequent units were delivered with Blomberg B trucks) — and, while the standard Blomberg B truck carries two brake shoes per wheel, many MP units were equipped with only a single brake shoe per wheel;
• #1555–#1574 were outfitted with the standard 81" nose, while the remaining units (all built in December 1976 or later) came with an 88" nose;

Complete list

GP15T

EMD GP15T
Type and origin Power type Diesel-electric Builder General Motors Electro-Motive Division (EMD) Model GP15T Build date October 1982 – April 1983 Total produced 28
Specifications Configuration: ​  • AAR B-B Gauge 4 ft 8+1⁄2 in (1,435 mm) Cylinders 8 Loco brake Straight air, dynamic Train brakes Air
Performance figures Power output 1,500 hp (1.12 MW)
Career Locale United States

EMD built 28 examples of a variant, the GP15T, between October 1982 and April 1983. It was a very close cousin to the GP15-1, but used a turbocharger in order to generate more power from a smaller engine. Power was provided by an 8-cylinder diesel engine that generated 1,500 hp (1.12 MW), the same as the GP15-1, but with four fewer cylinders.[1]

28 examples of this locomotive model were built for American railroads. The Chessie System received the majority of them as C&O 1500-1524 (25 units), while the rest went to the Apalachicola Northern in Florida as AN 720-722 (3 units).[2]

GP15AC

EMD GP15AC
Type and origin Power type Diesel-electric Builder General Motors Electro-Motive Division (EMD) Build date November and December 1982 Total produced 34
Specifications Configuration: ​  • AAR B-B Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge
Career Locale United States

The GP15AC is a variant built between November and December 1982. This model differs from the GP15-1 due to Missouri Pacific specifying new AR10 AC alternators instead of rebuilt D32 DC generators. The only external difference between the GP15AC and the GP15-1 is a straight side sill (shared with the EMD GP15T) not related to the transmission difference.

34 examples of this locomotive model were built in total: 30 for Missouri Pacific Railroad, and four for Venezuela's IFE.[2]

See also

• G16 and G16C and Victorian Railways X class (diesel) built in Australia

References

• "GP15-1 specification page". GATX Rail Locomotive Group. Archived from the original on April 8, 2005. Retrieved June 25, 2005.
• "The History of EMD Diesel Engines". Pacific Southwest Railway Museum. Archived from the original on July 22, 2014. Retrieved December 14, 2005.
• Marre, Louis A. & Pinkepank, Jerry A. (1989). The Contemporary Diesel Spotter's Guide. Waukesha, WI: Kalmbach Books. ISBN 0-89024-088-4. LCCN 88083625. OCLC 19959644.

Further reading

• Sperandeo, Andy. "The EMD GP15-1: EMD's down-sized road switcher." Model Railroader, January 1990, 110–115.

External links

Wikimedia Commons has media related to EMD GP15-1 locomotives.

• Sarberenyi, Robert. EMD GP15-1, GP15AC, and GP15T Original Owners

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