2-567B 12-645E3 12-7FDL

2 12 12

567 645 668

8.5x10 9 1/16x10 9x10.5

835 904 . 1050

215 2500 2500

middle distillate fuel oils as offering the largest potential for reducing costs. Traditionally, the railroad industry has required that all diesel fuel purchased for use in locomotives must meet the ASTM No. 2 diesel fuel oil specification. If the railroad diesel fuel specification could be broadened, large savings in fuel costs might be realized. Since the fuel would be used in unmodified locomotive diesel engines, the fuel tolerance limitations of the engines would govern the extent that the fuel specification could be broadened. Acting on the advice of the oil refiners and the engine manufacturers, cetane and distillation range were chosen as the primary variables to be evaluated. A test matrix of fuels was selected and tested using both the EMD and GE 12 cylinder test engines. Based on the SwRI test results and a 12 month in-service field test, the AAR developed and published a recommmended broadened fuel specification. (3) A comparison of the ASTM No.2 diesel fuel specification and the AAR recomenda-tions for a Broadened Fuel Specification are given in Table V and shown graphically in Figure 1.(4)

taken to determine how the operating cost of the locomotive diesel engines can be reduced. Included within this program are studies in the following areas:

o Staged Fuel Injection o Electronic Fuel Injection o Ceramic Coatings o Lubrication o Engine Efficiency

- Turbocharger Coatings

- Effect of Worn Parts o Engine Wear Measurements

Staged fuel injection, combined with electronic fuel injection and ceramics, should allow the railroad industry to operate medium speed diesel engines efficiently on middle distillate fuels with cetane numbers as low as 20.

Table V

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