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[quote user="Overmod"]Because any Tier-4 (or better) build that does not use monocoque construction and SCR would be so heavy as to require more than four axles' worth of support, same as now understood for freight locomotives (but complicated with the added weight requirements of practical 440V HEP)[/quote] That is not completely correct. THE MPI 54AC is Tier 4, has 4 axles and no monocoque. The total weight is about 290,000 lbs. As MPI and GE are now both part of Wabtech and will offer the next passenger locomotive together. And here the intended Gevo-Tier 4 engine might let the scales tip to 3-axle trucks. The two Cummins 16VQSK60 weigh dry about 39,000 lbs without SCR, a Gevo-T4 59,700 lbs. But perhaps MPI/GE find ways to keep a diesel-electric to 4 axles. For the Dual Power (diesel + 3rd rail) the announced 3-axle trucks already. Regards, Volker
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