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Ge Evolution SeriesThe Evolution Series are GE Transportation Systems' new diesel locomotive models that meet the U.S. EPA's Tier II locomotive emissions standards that took effect in 2005. The Evolution Series locomotives can be delivered with either AC or DC transmission, depending on the railroad's preference. All are powered by the new GEVO 12-cylinder engine which delivers equivalent power to the old 16-cylinder engine while consuming less fuel and producing fewer emissions. Models Currently three different Evolution Series models have been produced. ES40DC The ES40DC (Evolution Series 4000 hp DC transmission) replaces the former Dash 9-40CW model in GE's range and, like the former model, has been delivered only to Norfolk Southern. NS appears to prefer a slightly lower-rated locomotive than other railroads. ES44DC The ES44DC (Evolution Series 4400 hp DC transmission) replaces the former Dash 9-44CW model in GE's range. A large order for these locomotives has been placed by the Burlington Northern Santa Fe Railway, which began to be delivered in early 2005. ES44AC The ES44AC (Evolution Series 4400 hp AC transmission) replaces the former AC4400CW model in GE's range. These locomotives have been ordered by both the Union Pacific Railroad (who refers to these locomotives as the C45ACCTE) and the BNSF, and deliveries to both are ongoing as of 2005. Identification and spotting features The Evolution Series locomotives very much resemble the previous Dash 9 and AC series safety cab models in superficial appearance. Both AC and DC models have the large cabinet behind the crew compartment on the left-hand size which on the AC models houses the traction inverters. The previous Dash 9 models had a much smaller cabinet here than the AC models did. It is thus difficult to distinguish the DC and AC versions of the Evolution Series. Above this cabinet, at the top of the cab end of the long hood, there are four ventilation openings where previous models had three. The lower-roofed engine compartment is shorter than on previous models, thanks to the shorter prime mover. Earlier models had substantial space between the exhaust stack and the radiator "wings", and this is lacking on the Evolution Series. The radiator section is significantly longer than the previous models, and appears more bulky. Unlike the earlier radiators, it overhangs at the rear. The sloped underside has two sections with different slope angles, unlike the single previous angle. The front end on top has a raised 'hump' - this area houses the enlarged intercooler system fitted to these locomotives. Overall length is the same, and the trucks and fuel tanks are identical. References
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