4-Bb. Line Curve Chart and LRV Dimensions.pdf

This is a technical specification document for the North Carolina transit authority's Blue Line Track Reprofile and Alignment Services rail grinding contract. The document presents line curve charting and Low Rail Vein (LRV) dimensional specifications that establish the technical parameters for rail profile restoration work across the Authority's rail network. The specifications define the geometric requirements and measurement standards that contractors must meet when performing rail grinding services to restore rail profile, remove surface defects, and improve wheel-rail interface performance. The technical drawings and dimensional data contained in this file serve as reference standards for evaluating contractor compliance with the contract's performance requirements and quality control specifications throughout the execution of rail grinding activities.

The document functions as a technical reference standard that contractors must utilize during planning and execution phases of the rail grinding work. These specifications ensure that all rail reprofile and alignment services meet established geometric tolerances and dimensional requirements necessary to extend rail life, reduce noise and vibration, and maintain safe operating conditions across the Authority's rail network. The LRV dimensions and curve chart data provide the measurable criteria against which the contractor's work will be evaluated for conformance to contract specifications and performance standards.