I bought the White Christmas 00609 ho train set for my son for Christmas.  The engine appears to be the reason it does not work.  It does not light or run.  Apparently not getting electricity. I was told to mail back....which does not help before Christmas..the only things I noticed was that the rear wheels on the engine do not move...the front two sets of wheels work...I wanted to take a chance that it is something minor that I could do.  Help