It is the difference between the theoretical cant required for such higher speed and actual cant provided. (3) Cant deficiency- Cant deficiency occurs when a train travels around a curve at a speed higher than the equilibrium speed.
(2) Equilibrium speed is the speed at which the centrifugal force developed during the movement of the vehicle on a curved track is exactly balanced by the cant provided. It is positive when the outer rail on a curved track is raised above inner rail and is negative when the inner rail on a curved track is raised above the outer rail. Definitions - (1) Cant or superelevation is the amount by which one rail is raised above the other rail. TRANSITIONS, SAFE SPEED AND SUPERELEVATION ON CURVESĤ04. Note : For narrow Gauge sections for which special schedules have been prescribed by the Zonal Railways, provisions in those schedules should be observed.
AUTOCAD LISP SPIRAL FROM LENGTH AND RADIUS TRIAL
(3) These limits are not applicable to curves laid with different gauge widening by railways as trial measure in consultation with RDSO. Uniformity of the gauge should be stressed in all cases to get better track riding quality. (2) Gauge on the wooden sleepered road however, need not be disturbed, if it is likely to cause spike killing of sleepers. (1) On new lines and on lines where complete renewal or through sleeper renewal is carried out, the track should be laid to the following standards. Gauge On Curves - The gauge on curve shall be to the following standards :. For reverse curves, however, stipulation as laid down in Para 408(3) shall apply.Ĥ03. Super elevation is provided by raising the outer rail. The level of inner rail of any curve is taken as reference level. Care should be taken that the cord or wire is applied to the side of the head of the rail at the gauge point. (4) The versine is obtained by stretching a fishing/nylon chord or wire taut between the end of chord length decided upon, and the measuring distance between the cord/wire and gauge face of the rail at the middle point of the chord. (The turn-out curve can also be checked by off-sets from the straight with the versine measuring stations 1.5 metres apart.) For checking the radii of turn-out and turn-in curves overlapping curve of 6 metres should be used and the versine measuring stations should be located at every 1.5 metres. (3) For measuring versines of a curve, 20 metres overlapping chords should normally be used with stations at 10 metres intervals. The angle subtended at the center by a chord of 30.5 metres, is the degree of the curve.Ĭurves shall be described invariably by the radius in metres. (2) Curves can be designated by the radius in metres or by its degree.
Determination of Radius - (1) The radius of a curve is determined by measuring the versine on a chord of known length, from the equation,
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