What type of screws does Bachmann use to attach wheel sets to On30 freight cars?
Also what is the item number and can the parts be ordered from Bachmann?
Thank you!

 Yes, I am aware that quite a few hobby shops offer this model with sound already installed for $150-$200, however when I purchased my model that wasn't an option.
Thank you.

 It's the modern 4-4-0.

Which is the best sound system to have installed in a Bachmann HO 4-4-0?

 Is there any special wiring that needs to be done with DCC in order to change directions for the engine on a Wye turnout?

Jerry,
Thanks for the feedback. I'm currently operating in DCC. What I planned to do with the Wye is turn equipment around.
Thank you,
Alan

 Is there any special wiring and/or insulated rail joiners to be installed when using the Bachmann Wye switch?

Will a Bachmann decoder fit into a Roundhouse 2-8-0 steam engine and a Roundhouse 4-4-0 steam engine without any difficulty?
Secondly will Bachmann's Dynamis wireless DCC operate analog type locomotives?

Does Bachmann or some other manufacturer make an oil bunker for Bachmann's 4-6-0?