Horizontal curves - railways, Mechanical Engineering

Horizontal Curves - Railways

In railway engineering, the horizontal curve is defined by its degree as well as by its radius. The degree is the angle subtended at the centre by a chord of 100 ft (30.5 m).

780_Horizontal Curves.png

Figure: Degree of a Curve

D = 360/2π R× 30.5

assuming that the length of chord and arc is the same.

= 1750/R

For Broad Gauge, the maximum degree of curvature permitted is 100 or 175 m radius.

When a train is travelling on a curve, the outer rail has to be raised with respect to the inner rail to counteract the centrifugal force (Figure).

866_Horizontal Curves1.png

Figure: Force on a Vehicle Moving on a Curved Path

The super-elevation (or cant) is given by the equation:

e =       V2/gR

where  e =  Superelevation,

v =  Speed in m/sec,

R = Radius in m, and

g = Acceleration due to gravity.

= V2/127 R

where  V =  Speed in Km/hr.

The maximum super-elevation provided on a BG track is 165 mm. A horizontal curve requires transitional ends.

Posted Date: 1/23/2013 12:34:25 AM | Location : United States







Related Discussions:- Horizontal curves - railways, Assignment Help, Ask Question on Horizontal curves - railways, Get Answer, Expert's Help, Horizontal curves - railways Discussions

Write discussion on Horizontal curves - railways
Your posts are moderated
Related Questions
what are the factors that affecting the fatigue behaviour of materials?

how to calculate point of contraflexure in SFD and BMD

Characteristics Computerized Scheduling And Control Manufacturing Systems Introduction This section illustrates the unique characteristics of CCS or Computer Controlled Sc

Develop an EES Code for a Rankine cycle with reheat and with 2 open feedwater heaters.  The cycle is shown below:  Use the following conditions: 1.  700 psi, 850F 2.  500

What are combined footings? COMBINED FOOTINGS: When a footing supports two or more columns in the same line, it is called a combined footing. The combined footing which supp

causes and remedy of coldshut,misruns,shirnkage cavity,microporosity,metal penetration,mismatch

Define Properties of System For defining any type of system particular parameters are required. Properties are those observable characteristics of the system, which can be util


Evaluate total heat of steam: 10 kg of wet saturated steam at 15 bar pressure is superheated to the temperature of 290°C at constant pressure. Find heat needed and the total

A ball is thrown from a point with a speed V  at an angle of projection  θ . From the same point and  at the same instant, a person starts running with a constant speed V/2 to catc