@WindupGuy- What a set!! I am not sure that I have even seen a Dorfan box before...which is strange since I lived, for the first 17 years of my life, in a suburb of Newark, N.J. Based on your pictures, I looked in my "Dorfan" reference, which is not very elaborate, and date your set to around 1925 especially from the #355 Pullman's. What an outstanding set, now approaching 100 years old. Super find.
Best wishes and Happy Holiday's
Don