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A unique feature of these units is that there is a variable traction control system in their computer systems.
One of the differences between an ES44AC and an ES44C4 are the air cylinders and linkages on the truck sideframes of the ES44C4 ; these are part of the traction control system.
Every time a variable in grade, traction, or wheel slip occurs, the computer will adjust the pressure in these cylinders to maintain sufficient adhesion, by varying the weight on the drive axles.

1.813 seconds.