Hi Jonathan,  Thanks for the reply but I've already purchased the Spectrum Cavalier and plan on moving forward with fitting this one out with sound.

OK, I'm a newbie at the whole model train thing.  I purchased Bachmann Spectrum Cavalier HO set to have around the Christmas tree for the grandkids.  I want to add sound to this to add to the excitement for the grandkids.  What do I need to do?  Also, with this train set, the engine is very slow!  How do I get more power to it?  It has been broken in, oiled and greased but it is SLOW!