page_title: EMD SD70 series
section_title: SD70ACU
hierarchical_section_title: EMD SD70 series / Rebuilds / SD70ACU
caption_attribution_description: English: ns train 238 with a SD70ACU
context_page_description: The EMD SD70 is a series of road switcher diesel-electric locomotives produced by Electro-Motive Diesel in response to the GE Dash 9-44CW. Production commenced in late 1992 and since then over 5,700 units have been produced; most of these are the SD70M and SD70MAC models. All locomotives of this series are hood units with C-C trucks, except the SD70ACe-P4 which has a B1-1B wheel configuration, and the SD70ACe-BB, which has a B-B-B-B wheel arrangement.
  Superseding the HT-C truck, a new bolsterless radial HTCR truck was fitted to all EMD SD70s built 1992-2002; in 2003 the non-radial HTSC truck was made standard on the SD70ACe and SD70M-2 models; the radial HTCR truck remained available as an option.
context_section_description: The SD70ACU was first built by EMD and later rebuilt by Norfolk Southern. It is originally an SD90MAC (or better known as a SD9043MAC) that has been rebuilt to renew its electrical components and replace the cab with the new EMD Phase-II cab to comply with the most recent safety requirements. These locomotives are similar to the SD70ACe model, but the main body features are all reminiscent to the SD90MAC features. They also have the latest EMD cab that meets current FRA crashworthiness standards. These locomotives also have the Ultra Cab II, locomotive speed limiter (LSL), and cab signals. 100 of the 110 units Norfolk Southern purchased were originally SD9043MACs previously operated by the Union Pacific Railroad. The other 10 units were acquired by a trade with Cit Group for MP15DCs. All NS-owned SD9043MACs are slowly being rebuilt by NS at its shops in Altoona, Pennsylvania. As of May 7, 2019, all 110 SD70ACU units owned by Norfolk Southern have been completed and released to active service.
  Canadian Pacific has also began a program to convert their SD90MAC units into SD70ACUs, but unlike Norfolk Southern, Progress Rail is performing the rebuilds. The first of these have since been released. The initial order was for 30 units and then increased to 60. Canadian Pacific originally rostered 61 SD90MACs, These units spent much of the 2010-decade parked in long term storage, with the exception of three, which were retired and scrapped in 2012. The remaining 58, along with two surplus Union Pacific SD90MACs, will be used as cores for the 60 SD70ACUs.  10 have been painted in the classic CP tuscan and grey paint scheme, and 5 as special armed forces units.  The remainder will receive the standard CP red paint scheme.
caption: NS SD70ACU 7305
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