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Main line track

The primary track within a railway system used for through train movements, typically experiencing higher speeds and traffic.

Qualified inspector

A person officially recognized as having the necessary training and certification to inspect railroad tracks for defects and ensure they meet safety standards.

Track Geometry Measurement System (TGMS)

A specialized machine or vehicle that uses sensors and technology to automatically measure various aspects of track geometry (like alignment, gauge, and surface) to detect defects.

Class 1-5 track

Categories of railroad track, defined by federal regulations, that determine the maximum allowable speed for trains. Higher classes (e.g., Class 5) permit faster train speeds.

Gross tons

A measurement of the total weight, including both the freight and the railcars, carried over a section of track, often used to indicate the intensity of track usage.

Waiver

An official agreement to temporarily or permanently set aside a specific rule or requirement, often granted by a regulatory body.

Code of Federal Regulations (CFR)