Why Don’t Railroads Need Expansion Joints?

mechanical stress counteracts thermal expansion

Railroads don't need expansion joints because mechanical stress from sleepers and ballast counteracts thermal expansion. This allows for faster, smoother rides with less maintenance.

• 🚂 Thermite welding creates continuous rails by fusing steel, eliminating the need for gaps.
• 🌡️ Rails expand in heat and contract in cold, but mechanical forces from the track bed prevent buckling.
• ⚖️ Railroads aim for a high neutral temperature to minimize winter tension cracks over summer buckling.
• 💥 Continuously welded rail is stronger and safer, allowing for higher train speeds.

A man in an orange jumpsuit crouches next to a railway track where a thermite weld is actively burning with intense flames.