I have noticed the same thing, My engines seem to run slower on the dynamis than they did on the EZ command.  I have only had the Dynamis for a few days and have not been able to play with it much.  Also, I have only ran two seperate engines, I will test some of my other engines this weekend.

I just bought a Bachmann HO Shay Loco.   Is there a recall???   

Thanks for all the replys.  I figured that was the case!!!!!! 

I recently purchased a Bachmann 3 truck shay loco with the tsunami DCC decoder.  This is my first experience with a shay.  When it runs at low speeds the synchronized chuffs sound like they are running at a high RPM.  Is this normal for a Shay?  I realize that the RPM's would naturally be faster than a normal engine due to the mechanics of the Engine and the smaller diameter of the wheel.  I just did not think that it would be that much faster.  Does anyone here have one of these Shays? and if so, is this normal. 

Thanks.  All of my turnouts are powered on a different system, so only my trains are running through the EZ Command controller

Thanks for all the replys!!!  I am running the Bachmann EZ Command system.  So, if I am understanding correctly, there will be no harm to the Engines themselves if left idling such as overheating etc...?  The only problems may be power drain for other engines that may be running on the track!   Correct??

Is there any harm in leaving a digital engine on track idling while running other engines?  If so, how long is it safe to allow engine to idle?  I am currently running 3 Bachmann Spectrum DCC engines with Tsunami sound.