1. What is Number of Sleepers per Km Calculator?

Definition: This calculator estimates the number of sleepers (railroad ties) needed per kilometer of railway track based on rail length, density factor, and number of rails.

Purpose: It helps railway engineers and construction teams determine the quantity of sleepers required for track laying projects.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( N_s \) — Number of sleepers per kilometer
• \( L \) — Length of single rail (meters)
• \( x \) — Density factor (typically 4-7 for main tracks)
• \( N \) — Number of rails per kilometer

Explanation: The formula accounts for rail length plus a density factor, multiplied by the number of rails, then divided by 2 since sleepers support both rails.

3. Importance of Sleeper Calculation

Details: Accurate sleeper calculation ensures proper track stability, load distribution, and maintenance of correct gauge width between rails.

4. Using the Calculator

Tips: Enter the rail length (default 13m for broad gauge), density factor (default 6), and number of rails per km (default 154). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the density factor?
A: The density factor (x) is added to rail length to determine sleeper spacing. In India, values of 4-7 are used for main tracks.

Q2: Why is the result divided by 2?
A: Because each sleeper supports both rails in a track, so the total is halved to avoid double-counting.

Q3: What's a typical number of rails per km?
A: Standard is 154 rails per km for broad gauge tracks in India.

Q4: How does rail length affect sleeper count?
A: Longer rails generally require fewer sleepers as spacing can be increased while maintaining track stability.

Q5: Should I add a margin for errors?
A: Yes, consider adding 5-10% to the calculated quantity for breakages and replacements.

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