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for an intermodal stack train give me GP60's, they are better top ender's than any six axle and have better wheel slip controls, ride and throttle response than GE's comparable models Dash 8 39B, Dash 8 40B.  for a manifest or a rack train, SD70M's, they pull good, respond to throttle much better than C44 Dash 9's (especially to keep the slack on a rack train or poorly made up manifest off of you in a swag) and they ride better than the GE's.  For a very heavy loaded coal or grain train I would take this comination (not taking into account any DP's, just head end power), SD90MAC, AC4400CW or ES44AC, and either as rear motor(s).  The 90 to pull immediately at the bottom of hills and when starting, the GE for lugging ability once it finally decides to load, and both for their dynamics.  The GE is better in Dyno's at higher speed while the EMD is simply unbelievable at lower speeds all the way down to zero..(by the way this is because the SD90mac has extended range tapered dynamics while the GE has extended range flat).  Switching...well if I had my choice for just pure switching an MP15AC, but where I'm at we usually get GP38's so make sure it has the 2 shoe per wheel brakes (better stopping, don't have to change shoes as often).  I'm still with-holding judgement on SD70Ace's as I haven't had enough experiences with them yet to judge 'em.
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