General Electric Genesis (officially trademarked GENESIS) is a series of passenger diesel locomotives produced by GE Transportation, then a subsidiary of General Electric. Between 1992 and 2001, a total of 321 units were built for Amtrak, Metro-North, and Via Rail. The Genesis series of locomotives was designed by General Electric in response to a specification published by Amtrak and ultimately selected over a competing design presented by Electro-Motive Diesel (EMD). Until the introduction of the Siemens Charger, the Genesis series had the lowest height of any North American diesel-electric locomotives, being lower than the previous-generation F40PH. This low height allows the locomotive to travel easily through low-profile tunnels in the Northeast Corridor. Technical design The GE Genesis series is unique among recently manufactured North American passenger locomotives in that it uses a single, monocoque carbody design styled by industrial designer Cesar Vergara, thus making it lighter, more aerodynamic, and more fuel efficient than its predecessors (F40PH, F59PH, P30CH, P32-BWH). However, this makes it more costly and time-consuming to maintain and repair. In 2004, Amtrak started installing bolt-on nose cones on its units for easy replacement in the event of a grade crossing collision with a vehicle. As an example of the improvements over the predecessor locomotives, the Genesis is 22% more fuel-efficient than the F40PH while producing 25% more power. In addition, all Genesis locomotives have four-stroke engines instead of the two-stroke engines previously used in EMD counterparts. The Genesis unit is a fully computerized locomotive which automatically controls all on-board functions, thus producing high reliability while keeping the maintenance requirements low. For example, its computers can automatically reduce the power plant's output in the event that the locomotive is overheating, or suffering from low oil pressure, low water pressure, or reduced airflow into the intakes, thus making it still operable. All Genesis engines can provide head-end power (HEP) to the train drawn from an alternator or inverter powered by the main engine at a maximum rating of , making each unit capable of providing HEP for up to 16 Superliner railcars. The P40DC and P42DC power plants can supply 60-hertz head-end power either from the HEP alternator with the engine speed-locked to 900 rpm (normal mode) or from the traction alternator with the engine speed-locked to 720 rpm (standby mode). In the latter case, traction power is unavailable. The P32AC-DM powerplant does not have to be locked at a