I am returning to HO model railroading after decades away. I am going through my old stuff, oiling greasing, all the things you need to do after 20-30 years. For the most part, it looks very good, but before I left the hobby I ran across serious bargains in one of my wife's antique stores- a flock of Proto 2000 diesels, some of which I really want, some to sell. I also bought some Bachman Spectrum steamers that are lovely, and all of Protos and the Spectrums seem to have DCC stuff on them. I may want to use DCC someday, but right now, I just want to run trains the way we did 30+ years ago. Is there a way to "turn off" the DCC equipment until I have my track done and the correct power for the DCC? I bought books on DCC and I might as well be doing algebra in an undersea Chinese maze.
To add onto what has been said above already--
Those Proto 2000 locomotives could be DC, DCC, or both. It all depends on how old they are and what exactly is installed inside. I'll try to summarize based on my experience with P2Ks:
--Older P2K locomotives (i.e. 20+ years old) are all DC, and may have a DC circuit board ("light board") for controlling the lights. For example, I have an older P2K PA that has a mars light that works on DC; the circuit board is what makes the mars light flash.
--Slightly older P2K locomotives (I don't know exact years, I would guess 15 years old or less?) will probably be DC, but with a circuit board that can be adapted to DCC. They will have a plug-in receptacle, usually eight pins, that can hold a DCC decoder. From the factory, the receptacle will have a small DC "board" plugged into it to allow use on a DC layout; to convert to DCC, you would remove the DC board and plug in a DCC decoder in its place. This is generally known as a "DCC ready" locomotive, because it's relatively easy to convert to DCC.
--There are newer P2K locomotives that come with installed DCC and sound. I believe most of these came in gray boxes, as opposed to the earlier mostly blue boxes. I think...but am not certain...that most of these have "dual mode" DCC decoders. What that means is the electronics can detect whether the locomotive is on a DC or DCC layout, and operate accordingly. I have one of these and it's great-- I first used it on a simple DC layout when I had an apartment, and later on in my house layout with DCC, it works fine too.
--If you happen to have an even more recent "Walthers Proto" locomotive, those may have DCC factory installed (they make both DC and DCC versions). I'm not sure whether they still have dual-mode decoders, however.
Probably the best way for us to help you determine what you have, if you wish, is to post a picture of the insides of your locomotives, specifically the circuit board.
Here's a picture of my locomotive closet with two P2K locomotives. The upper blue box is a DC one, with a plug-in receptacle. The lower gray box came with factory installed DCC, as the sticker indicates.