gleislage

Gleislage is a term used in railway engineering to describe the geometric condition and alignment of railway tracks. It covers the horizontal alignment (straight sections and curves), vertical alignment (gradients and cant or superelevation on curves), track gauge, cross level variations, and surface irregularities. The concept is central to safe operation, ride comfort, and efficient wheel-rail contact.

Key components of gleislage include track gauge (the distance between the two rails), cant or superelevation (the height difference between outer and inner rails on curves), lateral alignment (deviations from the intended curve or straight line), twist (variations in gauge along the track), vertical alignment (grading and vertical curvature), and surface defects or roughness. Together, these factors determine how smoothly trains can travel and how loads are transmitted to the track structure.

Measurement and assessment are carried out with track geometry cars and inspection systems that record parameters such as gauge, cant, alignment, twist, vertical profile, and surface condition. Results are compared against standards and tolerances defined by railway authorities and international guidelines to identify required maintenance.

Standards and maintenance aim to keep gleislage within safe and efficient limits. Poor gleislage can increase rolling resistance, accelerate wear on rails and wheels, amplify dynamic forces, and raise derailment risk. Maintenance approaches include tamping to restore alignment and ballast support, grinding to correct rail profiles, rail replacement, and adjustments to cant and gauge.

Gleislage is a foundational concept in track maintenance planning, quality control, and safety assessments for railway networks.