I have recently purchased a brand new Bachmann Spectrum DCC Sound 2-10-2 DM&IR.  After testing, I have found the following:

The locomotive jerks uncontrollably in forward and rearward operations and I can see the driver wheels binding to a stop each half-revolution.  The 4th main driver wheel set "slaps" the sides of the rails with each revolution of its turn.

I believe this to be one of the reasons why this locomotive jerks when it is operating.   

As this is a brand new, factory-sealed locomotive and I have found the exact same problem to exist with a brand new, factory-sealed 2-10-2 DCC Seaboard locomotive, this leads me to believe that these are not one-off issues but a systemic problem with this particular Bachmann engine.

I would like to find out if anyone else has encountered this problem.

LOYRR

I have Seuthe 10 & 11 smoke units installed in my HO scale steamers.  To date, I have only used Seuthe smoke fluid to generate smoke. 

I recently read that MTH offers Proto "coal-scented" Smoke Fluid.

http://www.railking1gauge.com/detail.asp?item=60-1047

My question: Is this fluid compatible with Seuthe smoke generators or will it damage the unit?

LOYRR

I recently purchased one HO scale Bachmann Spectrum PRR K4 with DCC and Sound.  This train comes equipped with metal drivers standard.  I would like to install in place of the metal geared driver wheel set a traction tire-equipped driver wheel set.  Bachmann does not make this item. 

Question: 
Does anyone know of a firm that can mill down and place traction tires on that third geared driver wheel set so that it can be installed and run properly on the K4?