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EMD's SD70ACe-P4 are in a B1-1B configuration, so axles 3 and 4 (those on either side of the fuel tank) having no traction motors. GE's ES44C4 are in a A1A-A1A configuration with axles 2 and 5 (the middle axle of each truck) having no traction motors.
The passenger unit has to trail to supply the head end power (HEP) to the coaches. The freight units do not have any HEP cables, so if they trailed the coaches would have no electricity.