3.8.
USE
The amount of superelevation to be built into a railway curve depends upon the kind of curve, the
sharpness of the curve, the gage of the track, and the speed of trains. On a simple curve, full superelevation is
given throughout the entire length and the runoff is made on tangents, as shown in table III. On a compound
curve other than a spiraled one, discussed in section III, full superelevation is given the curve of greatest degree
throughout its length; the superelevation is then reduced, as shown in table IV, until the proper superelevation is
attained for the curve of lesser degree. On a reverse curve, tile track is level at the point of reverse, and full
superelevation is obtained each way by raising the outside rails.
Table III. Length and Elevation of Runoffs Required at Various Train Speeds*
To convert--
Multiply by--
Inches to centimeters
2.54
Feet to centimeters
30.48
Miles to kilometers
1.61
67
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