EMD GP15

EMD GP15 (-1/T/AC)
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 GP15T GP15AC Build date June 1976 – March 1982 (-1) October 1982 – April 1983 (T) November & December 1982 (AC) Total produced 310 (-1) 28 (T) 34 (AC)
Specifications Configuration: ​ •AAR B-B Gauge 4 ft8+1⁄2in(1,435 mm)standard gauge Driverdia. 40 in (1,016 mm) Minimum curve 120 ft (36.6 m) Length: ​ • Over couplers 54 ft 11 in (16.74 m) Width 10 ft3+1⁄8in (3.127 m) (over hand rail supports) Height 15 ft2+1⁄2in (4.636 m) Loco weight 246,000 lb (111,600 kg) (-1) 244,000 lb (110,677 kg) (T) Fuel capacity 2,400 imp gal (11,000 L; 2,900 US gal) Lubricant cap. 135 US gal (511 L; 112 imp gal) Coolant cap. 210 US gal (795 L; 175 imp gal) Sandbox cap. 56 cu ft (1.59 m3) (basic) 72 cu ft (2.04 m3) (special) Prime mover EMD12-645E(-1/AC) EMD8-645E3C(T) RPM: ​ • RPM low idle 235 • RPM idle 300 • Maximum RPM 904 Engine type V122-stroke diesel(-1/AC) V82-stroke diesel(T) Aspiration Roots blower(-1/AC) Turbocharger(T) Displacement 7,740 cu in (126.8 L) (-1/AC) Alternator AR10 (AC) Generator AR10-D14 (-1/T) Traction motors 4×D77 (-1/T) ​ • Continuous 920Amperes(with 62:15 gearing) (-1/T) Cylinders 12 (-1/AC) 8 (T) Cylinder size 9.1 in × 10 in (231 mm × 254 mm) (-1/AC) Transmission diesel electric Loco brake Straight air Train brakes Westinghouse26Lair brake
Performance figures Maximum speed 53 mph (85 km/h) (with 65:12 gearing) 70 mph (110 km/h) (with 62:15 gearing) 76 mph (122 km/h) (with 61:16 gearing) 82 mph (132 km/h) (with 60:17 gearing) Power output 1,500hp(1.12 MW) Tractive effort 47,000 lbf (210 kN)
Career Locale United States

TheEMD GP15is a 4-axlediesel-electric locomotivebuilt byGeneral Motors Electro-Motive Divisionbetween June 1976 and April 1983. Intended to provide an alternative to the rebuilding programs that many railroads were applying to their early road switchers, it is generally employed as ayardswitcheror lightroad switcher.There were 3 variants made: the GP15-1, the GP15T, and the GP15AC. The GP15-1 and GP15AC are powered by a 12-cylinderEMD 645Eengine, which generates 1,500 hp (1,119 kW). The GP15T differs in that it uses aturbo charged8-cylinder instead of theroots blown12-cylinder to generate the same horsepower. The GP15AC differs from the others as it uses an AC alternator connected to the engine instead of a DC generator to drive the traction motors. The radiator section is similar to those found on theEMD SD40T-2andEMD 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".A number of GP15-1s remain in service today for yard work and light road duty.

History and variants

GP15-1

The GP15-1 was the most popular variant as it did not contain either of the newer technologies of the other two variants (turbocharging or AC control). EMD built a total of 310 units forAmericanrailroads in this variant between June 1976 and March 1982.

TheMissouri Pacific Railroadpurchased 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 onBlomberg Mtrucks rather than the more commonBlomberg 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;

Railroad	Quantity	Notes
Chicago and North Western Railway	25	Most in service withUnion Pacific Railroad
Conrail	100	#1600–1699 all retired byCSX Transportationand sold to GMTX. All retired byNorfolk Southern Railwayand sold to LTEX.
Missouri Pacific Railroad	160	Most in service with Union Pacific Railroad
St. Louis-San Francisco Railway	25	#100–124 All have been retired byBNSF Railway.Some traded to GMTX for GP38-2's
Totals	310

GP15T

Apalachicola Northern GP15T #722

EMD built 28 examples of a variant, theGP15T,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-cylinderdiesel engine that generated 1,500hp(1.12 MW), the same as the GP15-1, but with four fewer cylinders.

28 examples of this locomotive model were built forAmericanrailroads. TheChessie Systemreceived the majority of them as C&O 1500–1524 (25 units),while the rest went to theApalachicola Northern Railroadin Florida as AN 720–722 (3 units).

Railroad	Quantity	Notes
Chessie System	25	1500-1524
Apalachicola Northern Railroad	3	720-722
Totals	28

GP15AC

Union Pacific GP15AC #722

TheGP15ACis 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 theEMD GP15T) not related to the transmission difference.

34 examples of this locomotive model were built in total: 30 forMissouri Pacific Railroad,and four for Venezuela'sIFE.

Railroad	Quantity	Notes
Missouri Pacific Railroad	30
State Railways Institution	4
Totals	34

Rebuilds

Union Pacific has rebuilt 22 of their GP15-1's intoGP15N's at their Jenk's shop. These units received a microprocessor control system to increase adhesion, control options, and extend the life of the locomotive.

Preservation

In 2021,CSXdonated GP15T #1507 (built 1982 as C&O #1507) to theB&O Railroad MuseuminBaltimore, Maryland.It is the first GP15 class locomotive to be preserved.

References

• "GP15-1 specification page".GATX Rail Locomotive Group.Archived fromthe originalon April 8, 2005.RetrievedJune 25,2005.
• "The History of EMD Diesel Engines".Pacific Southwest Railway Museum.Archived fromthe originalon July 22, 2014.RetrievedDecember 14,2005.
• Marre, Louis A. & Pinkepank, Jerry A. (1989).The Contemporary Diesel Spotter's Guide.Waukesha, WI: Kalmbach Books.ISBN0-89024-088-4.LCCN88083625.OCLC19959644.

Further reading

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

External links

• EMD GP15T Operator's Manual
• Sarberenyi, Robert.EMD GP15-1, GP15AC, and GP15T Original Owners