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Amtrak puts out RFP for new and rebuilt locomotives.

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[quote user="HR616"]I'm pretty sure the NS Dash 8.5 rebuilds meet Tier 2.[/quote] The NS Dash-8.5 rebuilds were designed to achieve Tier 2. They had emission problems and the program was cancelled in 2016. [quote user="HR616"]I also heard that the 4 axle BNSF Dash 8s being rebuilt in Ft. Worth will be Tier 2 as well. It is certainly an option that can be installed on rebuilt 7FDL poweres locomotives, but it isn't requested by every customer.[/quote] The NS AC44C6M rebuilds are similar to to the BNSF AC44C4M. Both are rebuilt by GE. The 7FDL-16 engines are brought up one EPA level to Tier 1+: <a href="https://www.railwayage.com/mechanical/locomotives/locomotive-gems-gems/">https://www.railwayage.com/mechanical/locomotives/locomotive-gems-gems/</a> Tier 1+ is what EPA requires for these locomotive when rebuilt. [quote user="HR616"]MPI's Tier 4 dual mode locomotive proposal (for the NYC area) would ride on six axles. Of course, dual mode equipment adds weight, so a standard diesel model might be light enough for just four. [/quote] MPI/GE had an offer in IDOT's multi-state locomotive procurement according to PRIIA section 305 specification. So they already have a design for a Tier 4 locomotive. MPI/GE's weight estimate for a 3rd rail DM locomotive was 326,000 lbs based on a Gevo-T4. Taking Siemens' estimate for 3rd rail equipment and battery storage of about 35,000 lbs the pure diesel MPI/GE locomotive might be 4-axle at 290,000 lbs. That is what MPI HSP46 weighs. Source: <a href="http://www.highspeed-rail.org/Documents/Dual_Mode_DC_3rd_Rail-Appendix_A_4-110_MPH_-_for_TSCapproval.docx">http://www.highspeed-rail.org/Documents/Dual_Mode_DC_3rd_Rail-Appendix_A_4-110_MPH_-_for_TSCapproval.docx</a> But I haven't seen anything of this Tier 4 MPI /GE locomotive Regards, Volker
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