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APPENDIX D
The geometry of the curve at Wabash and Lake, proceeding north and west is as follows:
Curvature | Radius (ft) | Length (ft) | Superelevation (in.) |
294 | 26 | 0 to 1 | |
Tangent | - | 30 | 1 to 1 1/2 |
Lefthand | 155 | 33 | 1 1/2 to 4 |
Body of curve | 89.77 | 85 | 4 |
Lefthand | 150 | 73 | 4 to 2 |
Tangent | - | - | 2 to 0 |
Run off is 1/8 inch in 3 feet.
The equilibrium speed for the 89.77—ft radius curve is 10 mph. The theoretical overturning speed is in excess of 30 mph.