Page:NTSB RAR-77-10.pdf/31

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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.)
294.00 26 0 to 1
Tangent - 30 1 to 1 1/2
Lefthand 155.00 33 1 1/2 to 4
Body of curve 89.77 85 4
Lefthand 150.00 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.