Anyone I have just purchased a gorgeous NW 603.  I have a problem which needs some help.  The thing wont take a 22.5 degree curve without derailing the tender.  To me it seems that the design is either flawed or something else is going on but I can't figure it out.  It appears to me that the tender sits way to close to the Locomotive it's self when traversing curves.  Am I missing something that I should be doing to the Locomotive out of the box?