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I think NS was reluctant to buy the new, unproven Tier 4 locomotives. The use of EGR had led to large problems with particulate matter clogging valves in ruck engines. When you need more locomotive but don't want to buy new ones you have to rebuild old units. Rebuilding extends the usefull life of a locomotive and costs much less than a new one. Both programs seem to fall into the Remanufactured category with less than 25% worth of new parts. Otherwise they should have been rebuilt to Tier 4 standard in 2015 but they are Tier 0+ and Tier 1+. Regards, Volker
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