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Why Railroads Don't Need Expansion Joints

Practical Engineering · explainer · Watch on YouTube

Civil engineering & constructionTransit, cities & urban planningFundamental physics

What it is

Practical Engineering explains how continuous welded rail copes with thermal expansion by restraining it, using the relationship between temperature, stress and strain. The video is part of a series on railways.

Why Hacker News recommends it

Linked in rail and heat-related threads as the clear explanation of why railroads need no expansion joints and how heat problems are handled.

  • 1 people recommended it
  • 1 different months
  • 0 strong recommendations
  • first 2024, last 2026

What HN commenters said

  1. “Practical Engineering already explained the correct solution to this problem”

    Explains the correct solution to rail heat problems.

    jeffrallen, 2026-07 · Recommendation · in “Painting the sides of railroad rails white to reduce derailment”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: continuous welded rail, thermal expansion, railroads, civil engineering, track buckling

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