PROTO 2000 SERIES Limited Edition 31165 GP9i UNION PACIFIC 151 Quantum System DCC & Sound Specifications This item has been stored after running a few laps on a home layout. It is a Quantum Sound System specification, so it can be used with both analog and DCC. I have confirmed the running of the vehicle and the sound (analog and DCC). (DCC address is 3) I have confirmed that the front and rear lights are illuminated. Negotiations for a discount on this item are not possible. I am careful when checking the item, but there may be oversights. Please understand that this is a used item before purchasing.