@brianel_k-lineguy thank you so much for sharing that information and finally providing confirmation regarding this question I’ve had for the last 5 months! That boxcar is my favorite 50’ and possible favorite overall(love the “modernized” PS-1. 50’ by Atlas) I Had come across that the white door meant “clean lading only” but there was nothing I found, which I could substantiate, distinguishing that from the yellow door boxcars. Until your post- thank you again! I have to look in to picking up some of those books, I’ve been tempted at my last 3 train shows but didn’t/don’t know how much specific/hard-to-find information they contained vs. an internet search. However, your post has clarified that for me ha.
Regarding the 60’ former EL boxcar using EL stencils for the large C & R, it’s certainly visoleucine. A simple comparison of the C’s and R’s in Erie Lackawanna with the large letters on the Conrail boxcar certainly lend credence to that statement. Even when comparing(but it’s Atlas so I guess it’s to be expected) the Atlas O 60’ EL w/ that CR, there’s definitely a very strong resemblance. Thanks again for your help!