The ES44C4 has become extremely popular on BNSF. In the last three years, nearly 1,000 of these units has appeared on BNSF property! The unit is different from an ES44AC in that it only has four traction motors. The center axles on both trucks are not powered, giving this unit an A1A-A1A configuration rather than a C-C configuration. This results in a unit similar to a four-axle unit, but with the weight distributed over six axles.
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