TheEMD DE30AC andDM30AC are a class of 46 locomotives built between 1997–1999 byElectro-Motive Division in the Super Steel Plant inSchenectady, New York, for theLong Island Rail Road of theMetropolitan 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 20 DM30AC locomotives (diesel or third rail power).

EMD DE30AC/DM30AC
DM30AC 501 at New Hyde Park
Type and origin Power type Diesel-electric (DE30AC) Dual mode (DM30AC) Builder General Motors Electro-Motive Division (EMD) Model DE30AC, DM30AC Build date 1997–1999 Total produced 46
Specifications Configuration: ​  • AAR B-B  • UIC Bo′Bo′  • Commonwealth Bo-Bo Gauge 4 ft 8+1⁄2 in (1,435 mm)standard gauge Wheel diameter 44 in (1,118 mm) Minimum curve 135 ft (41 m) radius/ 43.5° (single unit) 240 ft (73 m) radius/ 23° (coupled) Wheelbase Locomotive: 46 ft 2 in (14.07 m) (betweentruck centers) Truck: 9 ft 6 in (2.90 m) Length 75 ft 0 in (22.86 m) Width 10 ft 1 in (3.07 m) Height 14 ft 4 in (4.37 m) Axle load 75,000 lb (34,019 kg) Max Adhesive weight 100% Loco weight DE30AC (400–403): 296,878 lb (134,662 kg) DE30AC (404–422): 291,735 lb (132,329 kg) DM30AC: 299,844 lb (136,007 kg) Fuel type Diesel (DE) Diesel and electric (DM) Fuel capacity DE: 3,000 US gal (11,000 L) DM: 2,400 US gal (9,100 L) Lubricant cap. 215 US gal (810 L) Coolant cap. 210 US gal (790 L) Sandbox cap. 10 cu ft (280 L) (Front) 5 cu ft (140 L) (Rear) Electric system/s Third rail, 750 V DC (DM only) Current pickup(s) Contact shoe (DM only) Prime mover EMD12N-710G3B-EC RPM range 434–904 Engine type 45°V12,two stroke cycle Aspiration Mechanically-assistedTurbocharger Displacement 8,520 cu in (139.6 L) Alternator EMD TA12-QBE Traction motors 4 ×Siemens 1TB2624-0TA02 720 hp (540 kW) Cylinders 12 Cylinder size 710 cu in (11.63 L)[1] Transmission AC-DC-AC MU working Yes Train heating Locomotive-suppliedhead-end power Loco brake KNORR CCB1 (26C) Train brakes KNORR CCB1 (26C) Safety systems Cab signalling,ATC
Performance figures Maximum speed 100 mph (160 km/h) (diesel) 80 mph (130 km/h) (electric)[2](92:19 gear ratio) Power output Diesel: 3,000 hp (2,237 kW)[2][3] Electric: 2,880 hp (2,150 kW)(DM30AC only)[2] Max @ Rail: 2,873 hp (2,142 kW) Tractive effort Starting: 80,000 lbf (356 kN) Continuous: 60,000 lbf (267 kN) @20 mph (32.2 km/h) Factor of adh. ~3.7 Brakeforce 30,000 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)
Career Operators Long Island Rail Road Number in class 24 (DE30AC) 20 (DM30AC) Numbers 400–423 (DE30AC) 500–522 (DM30AC) Disposition Locomotive #503 damaged in a fire in October 2000 Locomotive #507 converted to #423 after electrical cabinet failure Locomotive #511 retired due to derailment in May 2019 Rest of fleet operational
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The DE30AC and DM30AC locomotives replaced agingGP38 locomotives, with GP38s used topush and pull diesel trains and other locomotives converted intopower packs (cab control) used to providehead-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 theEast River Tunnels intoNew 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 thePort Jefferson,Montauk, andOyster Bay branches, usually during peak times. Due to their height, the DE30AC and DM30AC locomotives, as well as theC3 bilevel railcars that they typically haul, cannot fit through the63rd Street Tunnel, and are thus unable to serveGrand Central Madison station.^[4]

Single engines run with six cars or fewer, in which case the engine is on the east end of the train and a C3 cab car is on the west (Manhattan-facing) end. Generally, two engines are used when there are seven or more cars. Running in electric mode requires two DM30ACs per train regardless of train length.

• DM30AC 503 was damaged in an accident atHuntington on October 23, 2000, when a defective shoe beam caused a 750-voltshort circuit with the locomotive'sthird rail contact shoe, which in turn caused the locomotive to catch fire.^[5] It sat in the LIRR'sMorris Park Facility and had been stripped for spare parts to maintain the remainder of the fleet until July 2018, when it was scrapped.
• DM30AC 511 was damaged in an accident on May 25, 2019. It hit a 14-unit long train stopped at the siding east ofSpeonk station, which is 13 units long; this caused the locomotive to lose a third rail shoe and sustain frame damage.^[6] It is now sitting in theMorris Park Facility, most likely to be used for parts before being scrapped.^[7]

In addition, DM30AC 507 suffered an electrical cabinet failure. Unlike 503 and 511, it was salvaged by being converted into a DE30AC locomotive, renumbered to 423, and returned to service.

In December 2020, theMetropolitan Transportation Authority of New York board approved aFederal Transit Administration-funded $335 million contract for 27 dual-mode locomotives, based on theSiemens Charger design. The order also includes additional options for up to 144 more locomotives, of which 66 could go to the LIRR.^[8][9] As a part of the Long Island Railroad's Capital Program, the railroad is exercising Option 3 of the previously awarded contract to order up to 44 new dual-mode locomotives, which would likely replace the older DE30AC and DM30AC locomotives.^[10][11]

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  DE30AC #401
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  DM30AC #515
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  The cab of engine #513
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  Third rail conductor shoe on DM30AC #514.
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  The remnants of engine #503
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  The cab of engine #503

• C3 (railcar)

•   Media related toEMD DE30AC locomotives at Wikimedia Commons
•   Media related toEMD DM30AC locomotives at Wikimedia Commons
• EMD DE30AC/DM30AC Sell Sheetvia Archive.org