What is the minimum required flangway width at turnouts and track crossings according to the FRA?

The minimum required flangeway width at turnouts and track crossings, as stipulated by the Federal Railroad Administration (FRA), is 1.5 inches. This specification is crucial for ensuring the safe passage of trains through turnouts and crossings, as it allows enough space for the rail vehicle wheels to safely navigate the track geometry without encountering issues such as wheel drop or derailment. The 1.5-inch width is designed to accommodate a variety of wheel designs and sizes while ensuring optimal safety and stability.

Standards like this are established based on engineering principles and safety data, aimed at preventing accidents and ensuring smooth operations on rail tracks. Proper flangeway width is an essential aspect of track design that helps in maintaining both the integrity of the track structure and the safety of the train operations.