What is the width of the top portion of a flat footed rail?

The standard width of the top portion of a flat-footed rail is indeed 66.67 mm. Flat-footed rails are designed with a base that has a uniform width, allowing for better distribution of load and stability when installed on sleepers. This width not only provides adequate support to the rail but also helps in minimizing the wear on the railbed and the infrastructure surrounding the track.

The choice of 66.67 mm is based on industry standards that have been established to optimize the performance of the rail in various conditions, including high-speed and heavy-load scenarios. Using this specific width helps ensure that the rail can effectively handle the stresses imposed by trains while maintaining structural integrity and longevity.

In rail design, the dimensions of various components are critical for safety and functionality, and the use of standardized dimensions like 66.67 mm allows for compatibility and interchangeability across different rail systems.