Trains on the Pokey today

NW Mailing List nw-mailing-list at
Thu Apr 9 06:30:52 EDT 2009

The 24 Norfolk Southern ES44ACs do not have CTE software. The CTE feature you describe is used on Union Pacific AC4400CWs. In order to reduce the tractive effort to levels safe for manifest trains, NS pusher crews on ES44ACs are instructed to cut out axles to match the maximum number of powered axles for that train.

Tom Hoover
GE Service Manager
Roanoke, VA
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Subject: Re: Trains on the Pokey today

> what is the CTE software?
> Nathan Simmons

Controlled Tractive Effort... reduces the TE curve from 145,000pds to 110,000pds when the unit is below 11mph. Normally used in DPU operation on manifests on other roads... however, it would make sense for it to be enabled even when manned, given that these units are max axle load units (432,000lbs) and have the high-adhesion software set to 36,000/200,000 (36,000lbs max TE per motor, 200,000pds max TE for the unit)

Robb Fisher

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