I got my first N scale set for Christmas, the Empire Builder.  I set it up last night and the engine won't run.  I have checked and rechecked the track.  I ran a multi meter around the track and power seems to be consistent.  The light comes on the engine and increasing as I add power and flickers when I change direction so it is getting power. 

Is there something I can do to the engine like take it apart to look at the motor?