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[quote]QUOTE: Originally posted by M.W. Hemphill Today, six-axle is virtually the only choice, for four reasons: 1. System standardization; it works for everything and avoids power or trains sitting around waiting on the "right" power. 2. Higher horsepower now available, in the plus 4000-range, is easier to get to the rail with six axles than four -- better adhesion. 3. Sale or abandonment of most secondary, light-rail, light-bridge lines and branch lines that once were the nearly pure domain of the four-axle unit (or the light-weight six-axle unit, a real oddball), which leaves fewer jobs for the four-axle that only it can do. 4. Greater emphasis on bulk traffic, whether it is coal, grain, or double stacks. [/quote] May I add a fifth reason: 5. With the advent of radial steering to three axle trucks, rail and flange wear from SD's are no longer a problem for railroads with heavy curvature such as the Alaska RR.
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