Silver Streak Cars with Blue Strip added

At least three cars, 529, 531 and 532, were given a bright blue stripe in the Silver Streak fleet, for example 531:


Anyone with photos of 529, 532 and others?

Silver Streak: http://www.trainsarefun.com/lirr/Silver ... Streak.htm

So these are the cars that Athearn used as prototypes for their Blue Box cars. I always wondered about that.