Sound Transit has awarded a multi-year, $24-million contract for rail grinding, polishing, and engineering inspection services to Advanced Rail Management, Corp. (ARM). The contract, which includes corrugation measurement and track geometry, ultrasonic, and eddy current testing as part of the inspection and quality assurance requirements, is among the most comprehensive rail assessment and maintenance contracts awarded by a North American transit agency. This ground-breaking contract is the first of its kind in North America to require rail polishing that adheres to customized acoustic requirements that are based on the ISO 3095 standard, which is considerably more demanding than the EN 13231-3 standard that North American railroads and transit systems typically grind to.
“Sound Transit's approach to looking after rail integrity, wear, and noise and vibration generated by the rail surface finish has resulted in achieving a high level of standards compared to other North American rail systems in the realm of rail grinding and maintenance programs,” said ARM President Gordon Bachinsky.
To achieve Sound Transit's goals, ARM, along with the National Research Council of Canada, an ARM consultant on the project, will implement a gradual-preventive grinding program. Through its comprehensive project team, ARM will have access to a variety of hi-rail and railbound rail grinding equipment fitted with coarse to extra-fine-grit grinding stones, depending on the metal-removal and surface-finish requirements. Milling equipment will also be available if needed to address surface damage requiring extensive metal removal.
To prepare for the grinding / polishing program, ARM and its consultants will conduct a comprehensive inspection to quantify rail surface conditions on the system. Measurement will include:
ARM will use data from these measurements to prioritize locations, estimate metal removal and the number of passes that will be required, and determine the total number of miles to be addressed in order to establish an effective gradual-preventive grinding program. Corrugation measurement data will be used to guide rail polishing efforts to meet Sound Transit's 5-micrometer surface roughness target within the wheel/rail running band.
“Sound Transit's grinding and polishing acceptance criteria will ensure that the wavelength signature of the finished rail will mitigate the types of noise and vibration-related problems previously encountered on the system,” said Mark Reimer, ARM's Director of Business Development & Projects.
The five-year contract, which may be extended for five additional one-year terms, applies to Sound Transit's existing Link Light Rail, as well as new line extensions, including the I-90 floating bridge across Lake Washington.
Advanced Rail Management Corp. is a consulting/services company that provides expertise in all areas of the wheel/rail interface to railways and rail transit systems.
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Advanced Rail Management Corp.