With some paitence and a bit of work, Rivarossi locomotives can be converted to run on DCC.
Yes, the Rivarossi U25C is equipped with a Loksound Select decoder that will run on DC. It is a "dual-mode" decoder.
http://www.esu.eu/en/products/loksound/loksound-select/
I have two of these locomotives and I'm quite happy with them.
Good Luck, Ed
With the Rivarosi U25c does the sound work with dc?
Thank you