|08-10-2007, 11:09 AM||#1|
Join Date: Aug 2005
Location: Calgary, Alberta, Canada
The last AC testbed locomotives constructed before series production of AC power began were the SD60MACs. Four units were built in 1991 and 1992. All worked on BN wearing BN numbers (9500-9503) and a special green and white paint scheme. They were only demonstrators, and the model was not intended for large-scale production. They achieved their purpose, resulting in large sales of the SD70MAC to BN and later BNSF. All SD60MACs remained owned by EMD. They lasted in service through the BNSF merger, but were returned in 1998. Since then, they have operated on the Transportation Technology Center test track, supplying braking power to simulate loads for other engines.
The SD60MAC has a 3-window cab like early SD60Ms (oddly enough, it was built in the era of 2-window SD60Ms). However, it has HTCR trucks like SD70-series engines.
RailPictures.Net Photo » Burlington Northern Railroad EMD SD60MAC
LocoPhotos.com - Photo Details - Burlington Northern - BN 9503
RailPictures.Net Photo » Burlington Northern Santa Fe EMD SD70MAC At work on BNSF, between two SD70MACs.
RailPictures.Net Photo » EMD EMD SD60MAC At its current job.
Fan of Conrail... also transition-era PRR, 70s Santa Fe, BN and SP, 70s-80s eastern CN, pre-merger-era UP, heavy electric operations in general, modern EFVM and Brazilian railroads in general... why bother trying to list them all?
Last edited by Triplex; 08-10-2007 at 11:13 AM..