EMD DE30AC and DM30AC

The DE30AC and DM30AC locomotives replaced aging GP38-2 locomotives, with GP38s used to push and pull diesel trains and other locomotives converted into power packs (cab control) 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, and Oyster Bay branches, usually during peak times. Due to their height, the DE30AC and DM30AC locomotives, as well as the C3 bilevel railcars that they typically haul, cannot fit through the 63rd Street Tunnel, and are thus unable to serve Grand Central Madison station. 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. ==Accidents==

• DM30AC 503 was damaged in an accident at Huntington on October 23, 2000, when a defective shoe beam caused a 750-volt short circuit with the locomotive's third rail contact shoe, which in turn caused the locomotive to catch fire. 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 511 was damaged in an accident on May 25, 2019. It hit a 14-unit long train stopped at the siding east of Speonk station, which is 13 units long; this caused the locomotive to lose a third rail shoe and sustain frame damage. It is now sitting in the Morris Park Facility, most likely to be used for parts before being scrapped. 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. == Planned replacement ==

In December 2020, the Metropolitan Transportation Authority of New York board approved a Federal Transit Administration-funded $335 million contract for 27 dual-mode locomotives, based on the Siemens Charger design. The order also includes additional options for up to 144 more locomotives, of which 66 could go to the LIRR. As a part of the Long Island Rail Road'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. == Gallery ==

Image:Eastbound train leaving Hunterspoint Avenue station, September 2018.JPG|DE30AC #401 Image:LIRR EMD DM30AC 515 pushing Train 8054.jpg|DM30AC #515 Image:LIRR513Cab.jpg|The cab of engine #513 Image:The_Third_Rail_conductor_shoe_on_DM30AC_-514._(June_2024).jpg|Third rail conductor shoe on DM30AC #514. Image:LIRR503August2011.jpg|The remnants of engine #503 Image:LIRR503StrippedCab.jpg|The cab of engine #503 == See also ==