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Ken, there are some locos that you just can't make behave using only CV3 and CV4.  I call them jackrabbits and they are really noticeable when trying to speed match locos.  Even seemingly identical locos may have a jackrabbit in the set. It is good that you now have the PR3 because you will need to set a custom speed table to slow down a jackrabbit loco that starts too fast even with CV3 set to 0 or 1 (or the Vstart setting at 0 if you are looking at the motor control panel on Decoder Pro....which I imagine you will be using.....and man, it is so much easier to play with CV settings using Decoder Pro).  I have at least a half dozen locos that "race off" relative to others even with zero'd acceleration settings. Learning about speed tables is part of the fun, I think.  Some decoders will have preset slow start tables that you can enter in CV25 for example (called exponential curves which is a fancy term for a series of settings of speed CVs that have very low values for the first half of the throttle settings and then rises at an increasingly faster rate to reach the final top speed [sorry to go on if this is all something you perhaps already know].   <IMG src="http://i168.photobucket.com/albums/u172/dcrane_2007/expcurve.jpg" mce_src="http://i168.photobucket.com/albums/u172/dcrane_2007/expcurve.jpg">    But with your PR3/Decoder Pro you can just set this curve yourself easily in the graphical speed table panel by pushing the slider buttons to values you want....which for some of my locos is a value of 0 for several of the first half dozen speed steps just to slow them down and extend that beginning crawl to match other locos which don't need a speed table at all to do this.   <IMG src="http://i168.photobucket.com/albums/u172/dcrane_2007/speedtable.jpg" mce_src="http://i168.photobucket.com/albums/u172/dcrane_2007/speedtable.jpg">
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