I have a bunch of what I believe are either EMD or railroad delivery photos of F3's in the form of postcards measuring 5 1/2" x 8 3/4". They were purchased at long since forgotten train shows. I include one that is representative of what I have. I happened to use this one when repainting LIONEL F3A and B units a long time ago. Would like to know if these are photos by EMD or the railroads taken at time of delivery. The back of the postcard dates the picture as 1947 and "Vanishing Vistas." Thanks.