Electro-Motive Diesel’s new SD70ACe debuted in 2005 and is not only the
main competition to General Electric’s Evolution Series™ of
road-switchers but also meets the EPA’s Tier 2 requirements for diesel locomotive
emissions. Although the SD70 series, which was first cataloged by the
company in 1992, has never been able to regain EMD's dominance as the
number one locomotive builder it was still a very successful design with
a few thousand different versions of the model
operating around the country today. The SD70ACe carries on the success
of variants like the SD70MAC and SD70M (which sold more than 2,700
examples combined), as EMD has outshopped more than 1,000 examples since
the locomotive debuted. Today, the locomotive can be found in
operation on every Class I except Canadian National
(which rosters the variant design, SD70M-2). Additionally, even
regional Montana Rail Link has purchased sixteen of the locomotives and
may order more as power requirements are needed.
CSX SD70ACe #4842 and a mate act as helpers shoving on a heavy coal drag near West End, West Virginia as the train eases past the B&O's old WS Tower on October 6, 2004.
The EMD SD70ACe, as with General Electric's Evolution models,
were born out of a requirement by the EPA that newly locomotives meet
the agency's new "Tier II" standards for diesel admissions. In the case
of GE its new GEVOs utilize a 12-cylinder prime mover
that also captures diesel exhaust and captures it as energy in storable
batteries to reuse later. While EMD has not yet achieved such
technological advances with its locomotives the SD70ACe is still holding
its own and is a fine design. Rated at 4,300 hp, the SD70ACe is
essentially a more environmentally friendly version of the builder’s
SD70 series and features EMD’s 16-cylinder model 710G3C-T2 engine, along with upgraded computer systems, electronics, and the builder’s famous self-steering trucks (the HTCR-II).
The HCTR-II is a significant reason why EMD products continue to sell
so well despite the fact that the company lags quite a ways behind GE
in research and development. The HTCR-II was created during the 1990s and first equipped on the original SD70 designs. It uses computer
software to steer itself into oncoming curves which greatly reduces the
wear on both truck, axles, and the track itself. While not quite as
successful, to date, as GE’s Evolution Series™ sales nonetheless have
been brisk. Hopefully with Electro-Motive Diesel, now part of the
Progress Rail Services Corporation (itself owned by Caterpillar, Inc.
will one day again become either leader of the locomotive or industry or
offer GE serious competition in the market.
While the EMD SD70ACe does use the same basic carbody of the SD70
series part of its design is inspired by SD80MAC of 1995. Although the
'80MAC (also known as the "Conrail Cadillac" because it was the only
railroad to purchase the locomotive) did not sell particularly well EMD
rearranged some of its features on the longer frame. Not only was it
the first model of the company's to feature the flared rear radiator (common on GE models
since the 1970s) but EMD also moved its dynamic brakes from directly
behind the cab to the very rear of the locomotive. This new design
feature was used on the later SD90MAC and kept with the SD70ACe as well.
BNSF SD70ACe #9166 heads an empty coal train near Gillette, Wyoming on May 27, 2011.
EMD also offered one notable variant of the locomotive for North
American lines, the SD70M-2. This locomotive was essentially the DC
version of the SD70ACe employing General Motors' model AR20AB generator instead of the TA17/CA7A alternator. Thus far the locomotive as been ordered by Canadian National
(numbered, 8000-8024, 8800-8874), Norfolk Southern (numbered
2649-2778), and Florida East Coast (numbered 100-107). Additionally,
EMD's three demonstrators of this variant went to CIT Financial as
leasing units. Dimensionally, the SD70ACe is 74 feet, 3 inches length
or about six feet shorter than the SD80MAC and SD90MAC.
EMD SD70ACe-P4/6 Production Roster (Known, To Date)
8100-8103 (Ex-SD70ACe-P6 Demos 1206, 1208-1210)
1206, 1208-1210, 4223 (SD70ACe-P6)
1207, 1211-1212 (SD70ACe-P4)
7000-7001 (Ex-SD70ACe-P4 Demos 1211-1212)
Union Pacific SD70ACes #8369 and #8343 work a freight a long way from home in Ontario, Canada on November 7, 2009.
effort ratings are very comparable to the GEVOs; 191,000 pounds starting
(slightly more) and 157,000 pounds continuous (slightly less).
There are also a few international variants of the model known
as the SD70ACe/Ic and the SD70ACS. The former was purchased by BHP
Billiton of Australia with a lower height profile to clear low hanging
obstacles. The latter design was developed for arid desert enivronments
and has been purchased by Saudi Railway, Mauritania's Société Nationale
Industrielle et Minière, and the Etihad Railway. The table below lists
those railroads and companies which have purchased SD70ACes and
SD70M-2s, including a few regional railroads.