I've read and hunted for a tutorial or write up on replacing the underframe and wipers on the 2-8-0.  Everything I've read about the subject is 2008 or 2009 and it says it is really tricky and frustrating.  I've tried twice and there just has to be a secret to doing this.  Any new information out there on this.  The YouTube stuff on Bachmann repair is less than helpful.

Thanks,
Joe 

You can find my write up on my installation of a Tsunami Sound Decoder in my Bachmann GP9 DCC On Board locomotive.


http://wwwjoe-daddy.blogspot.com/2013/05/bachmann-gp9-installing-tsunami-sound.html

I received the Bachmann Royal Gorge F7 AB with two passgenger cars for Christmas 2012.  Beautiful packaging, as I said, a gorgeous   looking unit.  Since the set was not DCC ready, I wanted to return it to Hobby Town but their return policy was to trade for something else.  Should have gotten a teddy bear.

1 - The observation car not only rolls roughly but will not stay coupled with anything else in the set.  Coupler height is the issue, fixing it will be another issue though.  
2- Converted the A unit to Tsunami Sound and all is good there.  
3 - Installed a Soundtraxx MC1Z102SQ  mobile decoder in the B unit and the train runs about 1-2 seconds stalls and starts again.  Swapped decoder to a P2K and Athearn units and works fine.  Installed NCE decoder and it works fine in the B unit BUT will not speed match well with the Tsunami.  

I've a train room full of Bachmann locomotives and must tell you the quality of this set is well below what I have been accustom to from Bachman.