The new HO RS-1 just released from Atlas is not DCC ready. However, the RS-1's lighting circuit board may easily be replaced (pseudo-plug'n play) by the following decoders :

MFG part # Tony's Price for 1
Wangrow DH104 $42.95
NCE DA102 (EU,US) $25.95
Lenz LE103ADUS $22.95
Digitrax DH150A $34.95