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Hi Bil and List Members,
Interesting insights there Bill!
From the flat car's point of view, this would
appear like it is a point load, since the flat carries the full load at
the spot where the load bolsters (is there a more correct term for this?)
are installed on the flat. Puting the point load right in the middle of the car
would make the load stress the worst it could possibly be, and moving it closer
to the trucks would help with this.
----- Original Message -----
Sent: Saturday, December 21, 2019 1:42
Subject: Re: [RealSTMFC] Bridge girder on
three PRR FM flat cars
OK. Here is my take on why the girder was not mounted to pivot
on the longitudinal center of the end flat cars…
Placing the pivot point closer to the truck would result in less overhang
inward on curves. Also doing so may reduce the outward overhang at the ends of
the girder. In short, there may have been operational restrictive reasons for
what appears to perhaps be an odd loading.
Also, a long shot idea here, loading closer to the trucks would perhaps
allow for a heavier load to be carried than what would be the limit if loaded
at the longitudinal center of the car.
Both of the above are just food for thought.
On Dec 21, 2019, at 7:20 AM, Claus Schlund \(HGM\)
Hi Brian and List Members,
Thanks Brian for calling our attention to
I find it interesting that the bridge girder is NOT
mounted on the exact center of the trio of PRR class FM flat cars,
and the bridge girder is instead somewhat closer to the camera.
This does two things that I find somewhat puzzling...
(1) It imbalances the load on the trucks on the two flats
at the ends - for each of these two cars, one truck will be carrying more
load than the other truck
(2) It required the brake wheel on the flat closest
to the camera to be removed. Had the load been placed so it was in the
center, that car maybe could have kept its brake wheel in place, as is the
case on the flat furthest from the camera. Note there is a removed
brakewheel mounted to the deck of the flat closest to the camera,
and another removed brakewheel mounted on the deck of the flat furthest from
the camera - presumably this last one came off the midle flat
Any thoughts on this?
Original Message -----
Sent: Saturday, December 21, 2019 10:08
Subject: [RealSTMFC] Bridge girder on
three PRR FM flat cars
EL photo archive today.