The distance between the adjoining faces of the running rail and the check rail/wing rail at the nose of the crossing is called:
Flangeway clearance
Flangeway Clearance in Railway Crossings
Railway tracks have special components called crossings that allow wheels to pass over the point where two rails intersect. These crossings are crucial parts of turnouts, enabling trains to switch from one track to another. At a railway crossing, there are specific distances between rails that are vital for the safe passage of train wheels, particularly the wheel flanges.
The question asks about a specific distance at the nose of the crossing, between the running rail and the check rail or wing rail. Let's look at the options provided:
- Flangeway clearance: This refers to the gap or clear space provided for the passage of the wheel flange between the running rail and the guard rail (or check rail) or between the point rail and the stock rail. At a crossing, it is the distance between the running rail and the wing rail on the side where the flange passes, and also the distance between the running rail and the check rail on the opposite side. This gap prevents the flange from hitting the rail head and guides the wheel through the crossing.
- Turnout: This is the entire assembly of rails, switches, and crossings that allows a train to diverge from one track to another. It is a structure, not a specific distance.
- Throw of the switch: This is the lateral distance by which the switch rail moves horizontally at its toe to either open or close the way to the diverging or straight track. This relates to the switch portion of a turnout, not the crossing nose.
- Heel Divergence: This is the distance between the gauge faces of the tongue rail and the stock rail at the heel of the switch. This is also a dimension associated with the switch part of a turnout, not the crossing nose.
Based on the definitions, the distance between the adjoining faces of the running rail and the check rail/wing rail at the nose of the crossing is specifically designed for the wheel flange to pass through. This distance is known as the flangeway clearance.
Therefore, the correct term for the distance described is Flangeway clearance.
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Select the correct answer using the code given below:
