coach roofs

[NW Modeling List]

 It is a new roof with the sheet metal pieced together. When Dad and I toured the shops in the late 40's, I saw one of the new PG roofs under construction, so I know how they did it. The new roof is 6" lower than the original clerestory. They put new ribs over the original clerestory ribs and then cut the tops off the original ribs. Apparantly they then reapplied the original top sheets to the new ribs and fabricated the new sheets on either side. As compared to the first "turtleback" conversions, I can't think of any reason to do this except "cosmetic."They matched the roofs on the streamlined cars!
Jim Nichols
    On Sunday, November 29, 2020, 10:31:39 PM CST, NW Modeling List <nw-modeling-list at nwhs.org> wrote:  
 
 Jim:Take a look at the photo I posted of the Powhatan Arrow.  When I zoom in on the roof of the BPd I think I see the original clerestory where added sides were rounded to create the streamlined roof. Or, was that a new roof with the sheet metal pieced together? I wish the N&W diagrams gave the height of passenger cars.  My B&O diagrams have an end drawing with dimensions of each car, very complete with height above the rails, total width, clerestory width, and whether air conditioning ducts were on one or both sides.  --Rick Morrison
 ----- Original Message -----  From: NW Modeling List  To: NW Modeling List  Sent: Sunday, November 29, 2020 5:07 PM Subject: coach roofs 
  Roger (and all) The ends were not the only difference. The first 3 PG's Roanoke modernized kept the clerestory roof structure for a car height of 14'. Roanoke rounded both sides and made appropriate rounded corners on the ends and called this a "turtleback" roof. On the later cars, they completely rebuilt the roof structure to make it a streamlined profile with a car height of 13'6" (same as the lightweights) So it was appropriate to make the ends flat. They even added the cinder deflectors they had put on the PM's. So if you are doing one of the first three cars, you need the taller "turtleback" roof. For the later cars (of which there were many more) any streamline roof section will do. Personally, I do not add to the bottom of the Northeastern roof (as Bob did). To my eye, the height is correct for a "streamline" roof as is. I also do not use completely flat ends (as Bob did) because the PG's kept the angled ends that were common to heavyweights. They just extended them upward. When I do a Rivarossi coach conversion, this requires a bit more work. After I fill the end windows, I entend the ends upward with about .015 styrene and them cover the whole end with sections of .005 to hide all the joints. Finally I cut the top to match the contour of my roof section, which has to be cut to fit between my new ends (angles included). 
 Jim Nichols 
 
 

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