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[quote user="tatans"]a goofy question - -  are these locos only used for passenger trains? like the e-8's, what would be the difference in a locomotive that was specifically designed for passenger service as opposed to freight? ? I would think horsepower, what else???[/quote] Amtrak hauls no freight... And yes, only passenger railroads operate this locomotive. The biggest differances between freight and passenger locomotives is the gear ratio (torque VS speed), top allowed speed, and the presence of an Head End Power (HEP) electric generator. Some older units (notably the older F40PH units - they were called "screamers" for a reason!) pulled the HEP power from the main diesel locomotive, but even that required seperate ports and fittings to do so. Back when trains were steam heated, diesels had steam generators instead of HEP generators.
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