Several questions

[Lackawanna Consortium]

1.  Lets say I purchase a new loco that is equipped with dcc.  But I run trains just using dc.  Will the new loco work ?

2.  Will all different manufacturers rolling stock run properly on Atlas code 80 snap-track?

3.  Does anyone know what Micro-Train couplers would I need to convert mostly older Bachmann and Atlas cars from the late 70's and 80's?

Thanks, Paul

[Maletrain]

1. Maybe.  Some decodes are "dual mode" to allow running on either DC or DCC.  They need to be properly programmed to run on DC, which means you need access to a DCC controller that can reprogram them.  Still, there may be problems with some "dual mode" decoders on DC.  Best to ask about the specific engine you are thinking about buying, including asking those here (or on other forms) who already have it if it has problems on DCC.
2. Yes
3. There is a list on the Microtrains website that is somewhat helpful.  There are a bunch of possibilities depending on exactly what cars you are trying to convert.  There are also options for shorter coupling if you will have gentle curves and want to make things look a little more realistic.  And, there is the option to convert to body-mounted couplers.  Cars are usually pretty easy.  Engines can be harder, especially small steam engines.

[ACY]

1. Current Bachmann n scale locomotives with DCC all include dual mode decoders. With that said they will run better on DCC,  but still run on DC. Many locomotives with sound decoders and older locomotives only work on DCC.
2. Some of the older rolling stock may experience issues, however anything made recently will work fine.
3. Each specific piece is unique check their website for a listing.

[brokemoto]

As others have stated, the B-mann power has "smart" decoders; the locomotives will run on either DCC or DC.   You would need to check the directions, or with the manufacturer on other power that has a factory decoder.

Yes, almost anything in N scale will  operate on Atlas code eighty track, be it sectional, turnouts or flex.   In fact, if the equipment does derail, run roughly or balk, it could be attributable to trackwork, curves or turnouts' being too sharp for the equipment or flaws in the equipment (deformed wheels, out of gauge wheels, archaic manufacturing methods, contacts out of place or dirty, improper assembly).

MT makes trucks with couplers mounted that will fit easily onto almost any Atlas rolling stock.  There are several varieties ranging from Civil War era to the most  modern roller bearing trucks.   On some of the most recent Atlas products, you are better off trimming the tongue from the  factory trucks and leaving them while body mounting the MT couplers.  There are tapped holes in the undercarriage for you to drill out and screw in the couplers.  Check MT's website, but most of the Atlas cars take 1023.

For older B-mann rolling stock (and, indeed, power) 1133 is almost universal.  If you have really sharp curves, use 1134, as that is simply a longer shank version of 1133.  For newer B-mann equipment, you will need to check MT's website.