What is the critical rail temperature?

The critical rail temperature is the temperature of CWR at which measures to protect traffic must be taken. It depends on the actual stress-free temperature, resistance to lateral movement offered by the ballast (ballast condition), track curvature and sleeper spacing.



People Also Ask

The stress-free temperature that is used is dependent on environmental extremes and thus varies with location. In the United Kingdom, CWR is stressed to 27 °C (81 °F), the mean summer rail temperature. In the US, standard stress free temperatures vary from 35 to 43 °C (90 to 110 °F).

MORE DETAILS

Even when ice glazes the landscape or temperatures dip dangerously low, railroads run 24/7. Maintaining operations in the face of Old Man Winter isn't easy, but with careful planning, experienced and dedicated crews, and specialized equipment and technology, railroads keep serving customers winter after frosty winter.

MORE DETAILS

Under normal operation, a wheel may obtain a tread temperature of 550 °C (1,022 °F). Under severe braking conditions, the generated thermal energy can contribute to thermal shock or alteration of the wheel's mechanical properties.

MORE DETAILS

Just as people can suffer sunburn or heat stroke from too much exposure to sunlight and hot temperatures, rail can bend or warp because of a blistering sun and sweltering temps. If the rail malformations known as a sun kink or track buckle aren't repaired in a timely manner, trains can derail.

MORE DETAILS

This stress can cause railway steel to fracture. In extreme heat, a length of CWR suffers compressive stress. This type of stress can cause sun kink where a length of a railway buckles laterally (sideways).

MORE DETAILS

The main reason is because buses and trains are enclosed spaces, so the HVAC (heating, ventilation and air conditioning) system has to be kept on to ensure proper air circulation for everyone on board.

MORE DETAILS

Like mentioned above, the rails aren't really affected by ice or snow. They are just chunks of metal. The biggest issue that rails face is the cold. Rails are restrained by rail anchors from expanding and contracting due to temperature changes.

MORE DETAILS

It's rare that a train might cancel a trip altogether due to weather, but it does happen. In winter, ensure that you keep your eye on the weather in order to keep surprises and unknowns at bay.

MORE DETAILS