The EMD DE30AC and EMD DM30AC are a class of 46 locomotives built in 19971998 by Electro-Motive Division in the Super Steel Plant in Schenectady, New York, for the Long Island Rail Road of the Metropolitan Transportation Authority (MTA) in New York. Originally divided equally between the two types, the fleet currently consists of 24 DE30AC locomotives (diesel power only) and 21 DM30AC locomotives (diesel or third rail power).

DM30AC 511 on the Cannonball express.
Type and origin
Power typeDiesel-electric
Dual mode
BuilderGeneral Motors Electro-Motive Division (EMD)
ModelDE30AC, DM30AC
Build date1999
Total produced46
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter44 in (1,118 mm)
Minimum curve135 ft (41 m) radius/ 43.5° (single unit)
240 ft (73 m) radius/ 23° (coupled)
WheelbaseLocomotive: 46 ft 2 in (14.07 m) (between truck centers)
Truck: 9 ft 6 in (2.90 m)
Length75 ft 0 in (22.86 m)
Width10 ft 1 in (3.07 m)
Height14 ft 4 in (4.37 m)
Axle load75,000 lb (34,019 kg) Max
Adhesive weight100%
Loco weightDE30AC (400-403): 296,878 lb (134,662 kilograms)
DE30AC (404-422): 291,735 lb (132,329 kilograms)
DM30AC: 299,844 lb (136,007 kilograms)
Fuel typeDiesel
Fuel capacity3,000 US gal (11,000 l; 2,500 imp gal) (DE)
2,400 US gal (9,100 l; 2,000 imp gal) (DM)
Lubricant cap.215 US gal (810 l; 179 imp gal)
Coolant cap.210 US gal (790 l; 170 imp gal)
Sandbox cap.10 cubic feet (280 L) (Front)
5 cubic feet (140 L) (Rear)
Prime moverEMD 12N-710G3B-EC
RPM range434-904
Engine type45° V12, two stroke cycle
AspirationMechanically-assisted Turbocharger
Displacement8,520 cu in (139.6 L)
AlternatorEMD TA12-QBE
Traction motorsSiemens 1TB2624-0TA02
720 hp (540 kW) each
Cylinder size710 cu in (11.63 L)[1]
MU workingYes
Train heatingLocomotive-supplied head-end power
Loco brakeDynamic / Regenerative / Electropneumatic
Train brakesKNORR SA-26 Electropneumatic
Safety systemsCab Signalling, ATS, ATC
Performance figures
Maximum speed100 mph (160 km/h) diesel,
80 mph (130 km/h) electric[2]
(92:19 gear ratio)
Power outputDiesel: 3,000 hp (2,200 kW)[2][3]
Electric: 2,151 kW (2,885 hp) (DM30AC only)[2]
Max @ Rail: 2,873 hp (2,142 kW)
Tractive effortStarting:
80,000 lbf (356 kN)
60,000 lbf (267 kN) @20 mph (32.2 km/h)
Factor of adh.~3.7
Brakeforce30,000 lbf (133 kN) from 40 mph (64.4 km/h) to 35 mph (56.3 km/h) (Electric Mode) or 15 mph (24.1 km/h) (Diesel Mode)
OperatorsLong Island Rail Road
Number in class24 (DE)
21 (DM)
Numbers400-423 (DE)
500-502, 504-506, 508-522 (DM)

Details and usage

The DE30AC and DM30AC locomotives replaced aging GP38s, Alco FA1/FA2s, F7As and F9As, and MP15AC and SW1001 locomotives, with GP38s used to push and pull diesel trains and other locomotives used to provide Head End Power for the trains. The bodies of the DE30AC and the DM30AC are extremely similar; the difference is the ability of the DM30AC to use electric third rail while the diesel engine is off, enabling the locomotive to use the East River Tunnels into New York Penn Station. This permits direct service from non-electrified lines in eastern Long Island via the western electrified main lines all the way to Penn Station. A few such trains a day run on the Port Jefferson, Montauk, Oyster Bay, and Greenport branches, usually during peak times.

Single engines run with six cars or fewer and engines are placed on the East (Montauk) end of the train. Generally two engines are used when there are seven or more cars. Of the original 46 locomotives, 45 are still in use. The one locomotive that was taken out of use was 503 (DM30AC), which was damaged in an accident at Huntington on October 23, 2000. It hit a shopping cart on the tracks, which shorted out the third rail and caused the locomotive to catch fire.[4] It sat in the LIRR's Morris Park Facility and had been stripped for spare parts to maintain the remainder of the fleet until July 2018, when it was scrapped. DM30AC 507 suffered an electrical cabinet failure, but unlike 503, it was saved by being converted into a DE30AC locomotive. It was renumbered to 423 and has since returned to service.

See also


  1. http://www.emdiesels.com/emdweb/products/pdf/EMD_710ECO_Repower_Solutions.pdf
  2. "Diesel-Electric Passenger Locomotives DE30AC and DM30AC" (PDF). Siemens AG. Retrieved 2011-01-14.
  3. LaMay, Robert A. (1998). "Long Island Rail Road's DE30 and DM30 Locomotives". Retrieved 2008-08-31.
  4. Demoretcky, Tom; Mason, Bill (October 24, 2000). "LIRR Fire Delays Port Jeff Branch". Newsday. p. A.28.
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