Merry Christmas everyone!  A few days ago, I decided to buy myself an early Christmas present.  I picked up a Bachmann Chattanooga HO scale train set from Hobby Town.  Once I got it together, I wanted to start it off slowly.  As soon as I turned on the speed controller, the train started spinning it's wheels, and took off.  Adjusting from the slow to fast setting changes the speed very little.  I can detect a slight change in the tone of the engine, but cannot visibly see a difference.  After watching videos and seeing different results online, I decided to check the voltage that it is supplying to the track.  At the slowest setting, the track is getting 30.22V.  At the high setting, it is getting 30.57V. 

What voltages should I expect to see at either end of the spectrum?  Is it possible that it was just wired incorrectly?  Any input would be greatly appreciated.  Thanks!