1) The New Haven's PS-1's are from the 1947-1948 era. AFAIK Kadee's PS-1 car models the later version produced in the 1950's. Would the Intermountain PS-1 have the correct carbody to model the New Haven cars.
The Intermountain PS-1 has "zits" in the apex of ends of the cars. Those "zits" I believe were first stamped on the PS-1's in 1950-1951. PS-1's built prior to that date had no "zits."