I got the dragon rail car panhard model to day. what color should it be .should it be germam grey fo dark yellow , cause on the box its dark yellow and i had a book about this and i lost it . but on the build sheet it says dark yellow and its 1942 but i heard that the germans used grey till 1943 so after 1943 all there stuff was dark yellow, so i guess the build sheet is worng

I'm not an expert by any means Tazz3, but from all I've seen and read, you are correct, the yellow was not standardized until 1943.

If you want to use yellow, but it's a 1942 model, just say that it didn't go into service until '43 :-)