Re: Gainesville Midland curves - multi radius reverse curve
| December 01, 2015 10:49PM |
Hi,
The top of the drawing is roughly northwest towards Gainesville GA.
The lower right is the former narrow gauge Jefferson branch standard gauged and extended to Athens GA.
The lower left is the former narrow gauge mainline to Monroe, GA.
The mutiple radius curve at Milepost 31 near the coal chute is interesting.
PC is point of curvature in the direction of increasing stations.
PCC is point of curve to curve in the direction of increasing stations.
The one I had not seen before is at 1642+72 - a PRC point of reverse curve.
PT is the point of tangent.
Just to point out in case you do not understand the abreviations:
1635+00 PC 12d30' R - 165300 feet from somewhere - point of curve - Degree of Curvature 12d30' (radius 458.4 feet) - R turn to the right.
PCC 16d30' R point of curve to curve (change radius) - Degree of Curvature 16d30' (radius 347.3 feet).
PCC 14d R point of curve to curve (change radius) - Degree of Curvature 14d (radius 409.3 feet).
1642+72 PRC 7d L - point of reverse curve - DoC 7 (radius 818.6') - L turn left
1651+50 PT - point of tangent
The hillside the Gainesville to Athens mainline is following is to the southwest (left) of the track. The Monroe Branch dodges through a saddle in the hill to head south to Monroe.
FWIW
Doug vV
The top of the drawing is roughly northwest towards Gainesville GA.
The lower right is the former narrow gauge Jefferson branch standard gauged and extended to Athens GA.
The lower left is the former narrow gauge mainline to Monroe, GA.
The mutiple radius curve at Milepost 31 near the coal chute is interesting.
PC is point of curvature in the direction of increasing stations.
PCC is point of curve to curve in the direction of increasing stations.
The one I had not seen before is at 1642+72 - a PRC point of reverse curve.
PT is the point of tangent.
Just to point out in case you do not understand the abreviations:
1635+00 PC 12d30' R - 165300 feet from somewhere - point of curve - Degree of Curvature 12d30' (radius 458.4 feet) - R turn to the right.
PCC 16d30' R point of curve to curve (change radius) - Degree of Curvature 16d30' (radius 347.3 feet).
PCC 14d R point of curve to curve (change radius) - Degree of Curvature 14d (radius 409.3 feet).
1642+72 PRC 7d L - point of reverse curve - DoC 7 (radius 818.6') - L turn left
1651+50 PT - point of tangent
The hillside the Gainesville to Athens mainline is following is to the southwest (left) of the track. The Monroe Branch dodges through a saddle in the hill to head south to Monroe.
FWIW
Doug vV
| Subject | Author | Posted |
|---|---|---|
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dougvv | November 29, 2015 06:02PM |
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dougvv | November 30, 2015 01:52PM |
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dougvv | December 01, 2015 10:49PM |
|
dougvv | December 05, 2015 08:17PM |
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