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The GP30 is 2,250 HP, and the SD40-2 is 3,000 - both are roughly 500 HP per axle, so they should be very similar on a per-axle basis. The problem, as you've noted, is that the 6 axle locos tend to derail when used on switching duties, especially in industiral areas with tight curves. So a trio of GP38's (2,000 HP each) or GP30's would typically be better for most switching assignments that a pair of SD40-2's. As for the Green Goats, the railroads are snapping them up because of reduced fuel consumption (cost), emissions (regulatory compliance), and because the price is definitely right - don't know about elsewhere, but from my reading it seems they are basically free in Texas and California - the states are buying them for the railroads with pollution control funds. From the looks of things, we'll be seeing lots of green goats in the future.
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