Reply to "METRA to Purchase SD70MACs for commuter service."

Hot WaterOGR Forum Member SUPPORTING MEMBER

To re-emphasize what Tom just posted above, the BN/BNSF SD70MAC units, having AC three phase induction traction motors, are NOT affected by higher RPM rotor speeds (they do NOT have the copper bar commutator as DC motors have). More than one SD70MAC unit was fully tested at the AAR Test Center, out in Colorado, and was also operated on the "Fast Track" at speeds up to 100 MPH. Nothing flew apart!

2/23/1910:48 AM

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