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Amtrak puts out RFP for new and rebuilt locomotives.

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[quote user="YoHo1975"]If they go rebuild, they wouldn't even need to reach Tier 2 depending on percentage new components.[/quote] You are right, as long as they stay below 50% of new parts they are required to reach 1+. Tier 1+ is the same as EPA Tier 1 final. But how does this fit with the announcement of "the lowest emissions possible"? Lowest possible emissions is Tier 4. [quote user="YoHo1975"]I wonder how much weight the monocoque saves and would the corner posts and other crashworthiness requirements undermine that?[/quote] The monocoque design once saved 20,000 lbs according to a GE conference paper. The 20,000 lbs were used up by integrating 4,000 hp instead 3,000 hp of previous locomotive and a 400 gal larger fuel tank (2,200 gal). SCR equipment, corner posts all add to the weight and might help to exceed the monocoque's and/or truck's load carrying limits. [quote user="YoHo1975"]Alternatively, I wonder if the newer 3 axle Radial or A1A/BB1 truck designs could be proven more reliable in Passenger service? We're a long time removed from the HT-C in terms of modern 3axle track design. Institutional memories probably run a bit longer than they need to here.[/quote] I don't think it is institutional memory, rather European experience with truck performance at higher speeds. Even the newest designs seem to perform worse than 2-axle trucks at higher speed. MPI/GE had a Tier 4 offering competing with the Siemens Charger but I have no clue of wheel arrangement and of technical design. Regards, Volker
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