Drawing Curves And Calculating Grades In Google Earth - Prescott & Phoenix RR (Santa Fe)

Watch as I redraw curves and grope for the vertical alignment.

0:10 Locating the center line of a circle at three past the decimal
5:00 Describing the overall project suggested in this video
7:50 Describing particulars of the passenger tunnel leading to Prescott
9:40 Drawing a point-of-tangent radial line to establish curve radius
14:50 Finding the compass of the curve
15:30 Calculating location of four radial lines needed to draw a large curve with the circle tool
16:50 Drawing the next radial line
21:25 Drawing circles
31:35 Necessity of having six navigation keys
33:50 Relocating the tunnel line to the perimeter of the new circle
41:25 Examining the revised tunnel alignment
43:35 Further speculative characteristics of the line, suggested tunnel and rolling stock
45:40 Showing the intentional fudge at point of tangent which makes for a short spiral
48:50 Describing the suggested alignment under the road
49:30 Rearranging the unintentional fudging at point of curve
51:45 Describing the suggested line through Prescott and on to Prescott Valley and the Airport
55:25 Examining the suggested tunnel with an aim towards finding a grading scheme
56:40 Tunnel summit and a view of the summit station on the original line
59:00 Groping for a vertical alignment
1:24:00 The suggested vertical alignment and how to calculate grades in percent
1:31:20 Solidifying the vertical alignment between the low spot and the station
1:36:15 One further abbreviation and discussion of it
1:41:10 Outro recorded in 2024