There is a new electric motor that is starting to appear in some brass locomotives and some high end plastic locomotives. This new motor has 7 poles and is a very smooth runner. Some power packs do not filter out all of the AC and this can cause 'jerky' running with a 7 pole motor. If a locomotive is equipped with DCC, all of the AC current will be filtered out and the motor will run smoothly.
The Tech III is also new state of the art power pack and will filter out all of the AC. Please keep in mind that you will need to upgrade your power pack in order to run these new high tech motors. Call our repair department if you want more technical information.