Number of Crossing (N) Calculator

Number of Crossing Formula:

\[ N = \frac{S}{L_c} \]

Number of Crossing (N):

1. What is Number of Crossing (N)?

Definition: Number of Crossing or 'frog' is a device that provides two flangeways through which the wheels of the flanges may move when two rails intersect each other at an angle.

Purpose: It helps in determining the angle at which two rails intersect in railway track construction.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ N = \frac{S}{L_c} \]

Where:

\( N \) — Number of Crossing
\( S \) — Spread at Leg of Crossing (%)
\( L_c \) — Length of Crossing from TNC (%)

Explanation: The spread at leg of crossing is divided by the length of crossing from TNC to determine the number of crossings.

3. Importance of Number of Crossing Calculation

Details: Proper calculation ensures safe rail intersections and smooth movement of train wheels across crossings.

4. Using the Calculator

Tips: Enter the spread at leg of crossing (%) and length of crossing from TNC (%). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical value for number of crossings?
A: Common values range from 8 to 16, depending on the angle of intersection.

Q2: How does the number affect rail operations?
A: Higher numbers mean shallower angles, allowing for higher speeds through the crossing.

Q3: What does TNC stand for?
A: TNC stands for Theoretical Nose of Crossing, the point where the two gauge lines intersect.

Q4: How accurate should these measurements be?
A: Measurements should be precise to ±5% for safe operation.

Q5: Does this include safety factors?
A: No, additional safety factors should be considered in actual track design.