Hello, I am new to this site but need help if possible, I bought an N Gauge Peter Witt Street Car with 'DCC on Board' ran on DC perfectly, was lent a Gaugemaster Prodigy Express DCC I believe it is sold under a different name in U.S. any way it ran well on DCC but now will NOT run on DC, I only gave it an address 4 figure and as far as I know change nothing else - can some one please tell me what to do? the strange thing is I programmed another Peter Witt but this time with a Bachmann Dynamis DCC set up and that Street Car runs on both systems, any help would be really appreciated, I am a total newbie to DCC, and long in the tooth 
Thank you in advance for any help you can give me

Fred