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Does someone have a link to papers with the fuel consumtion of C175-16 and C175-20 in locomotive service? All I found are C175s in stationary generator set. The fuel consumption differs from standby to prime to continuous service and for 50 Hz and 60 Hz. None of them were Tier 4. Here is a link to a data sheet of the MTU 4000 R03 series:  <a href="https://mtu.cwshops.com/print/3232331_MTU_Rail_spec_4000_03.pdf">https://mtu.cwshops.com/print/3232331_MTU_Rail_spec_4000_03.pdf</a> It contains fuel consumption at rated power and best point. Theoretically a four-stroke diesel engine should have better fuel efficiency than its two-stroke counterpart. To really prove it the engines should be otherwise designed to the same specifics: Bore, stroke capacity, power, rpm etc. In 1998 and 1999 the CARB initiated emission tests to find the influence of different diesel fuels:  <a href="https://www.arb.ca.gov/fuels/diesel/102000swri_dslemssn.pdf">https://www.arb.ca.gov/fuels/diesel/102000swri_dslemssn.pdf</a> Tested were three UP 9-44CW and three BNSF SD70MAC. Starting on page 75 the results including fuel consumption are gathered. I have only looked into the "CARB Fuel" section and here the SD70MAC uses marginally less fuel. But it looks like the difference in this case is within the measuring accuracy. Regards, Volker
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