What is railway canting?
Definitions – (1) Cant or superelevation is the amount by which one rail is raised above the other rail. 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.
What is rail inclination?
To minimise this rail spreading effect rails are often laid so they are tilted (inclined) slightly inward towards the centre of the track. This equalises the load through the fasteners and avoids the rails being spread apart in use.
What is equilibrium cant in railway?
When a train goes around a curve it exerts an outwards force on the tracks – tilting the track to be perpendicular to this force gives us “equilibrium cant” (Eq). Cant is a function of speed, radius and gauge – tighter curves or faster trains mean more cant.
How do you measure can t?
The Standard defining the cant measurement It is expressed as the height of the vertical leg of the right-angled triangle having a hypotenuse that relates to the nominal track gauge plus the width of the rail head rounded to the nearest 10 mm (refer to Figure 5).
What is cant rail in vehicle?
The cant rail forms a roof gutter along the upper longitudinal edge thereof, the side cover forms an eaves drop gutter along the upper longitudinal edge thereof and is spaced from the side of the car to produce a longitudinal door closure and hanger space, the cant rail and side cover form a downward and an upward …
Why are the rails tilted?
Why are the rails Tilted? Explanation: Maximum load of the wheel acts near the inner edge of the rail. This causes wear and tear of rails. For the reduction of wear and tear the rails are tilted.
What is rail alignment?
Alignment of railway line refers to the direction and position given to the centre line of the railway track on the ground in the horizontal and vertical planes. Horizontal alignment means the direction of the railway track in the plan including the straight path and the curves it follows.
What is canted track?
The cant of a railway track or camber of a road (also referred to as superelevation, cross slope or cross fall) is the rate of change in elevation (height) between the two rails or edges.
What is cant deficiency on tracks?
Cant deficiency means the additional height, which if added to the outer rail in a curve, at the designated vehicle speed, would provide a single resultant force, due to the combined effects of weight and centrifugal force on the vehicle, having a direction perpendicular to the plane of the track.
What is difference between cant and superelevation?
What is coning of rail?
The flanges of the wheels of railways are made in the slope of 1 in 20. This is termed as Coning of wheels. The tread of the wheels of a railway vehicle are not made flat, but sloped like a cone in order to enable these vehicles to move smoothly on curves as well as on linear straight track.
What is railway twist?
A twist fault is a condition where there is a difference in cross-levels between rails over a short distance. Twist faults may cause unloading of one or more of the wheels causing them to lose contact with the rail. Once contact with the running surface is lost the wheel can flange climb and derail the vehicle.
What is a cant angle?
A cant in architecture is an angled (oblique-angled) line or surface that cuts off a corner. Something with a cant is canted.
What is meant by negative cant?
Negative Cant/ Super-elevation is a unique situation which occurs when the main line lies on a curve with a branch line turnout of contrary flexure.
What is an example of cant?
A cant is defined as an external angle in a building. An example of a cant is the corner of the brick library.
What is the function of cant on a railway track?
On railways, cant helps a train steer around a curve, keeping the wheel flanges from touching the rails, minimizing friction, wear and rail squeal . The main functions of cant are the following:
How much canted in railway tracks?
The rails themselves are now usually canted inwards by about 5 to 10 percent. In 1925 about 15 of 36 major American railways had adopted this practice. In civil engineering, cant is often referred to as cross slope or camber.
What is the meaning of cant in civil engineering?
In civil engineering, cant is often referred to as cross slope or camber. It helps rainwater drain from the road surface. Along straight or gently curved sections, the middle of the road is normally higher than the edges. This is called “normal crown” and helps shed rainwater off the sides of the road.
What is the function of cant in a curve?
The main functions of cant are the following: The necessary cant in a curve depends on the expected speed of the trains and the radius. However, it may be necessary to select a compromise value at design time, for example if slow-moving trains may occasionally use tracks intended for high-speed trains .