Sound Transit al-preventive grinding program. Corrugation measurement data is used to guide rail polishing efforts to meet Sound Transit's five-micrometer surface roughness target within the wheel/rail running band. Through the partners it assemA Link light-rail train makes its way through the Rainier Valley in Seattle. Photo: Glenn Landberg/Sound Transit " The first order of business was to assess overall wheel/rail conditions on the system, " McGinn said. Following that, a revised set of rail profiles designed by the NRC was adopted; a grinding plan was developed and implemented. ARM used data from the measurements to prioritize locations, estimate metal removal and the number of passes that would be required and determine the total number of miles to be addressed to establish an effective gradubled, ARM provided access to a variety of rail bound and hi-rail grinding equipment that were fitted with coarse to extra-fine-grit grinding stones, depending on the metal-removal and surface-finish requirements. Milling equipment is also available if needed to address surface damage requiring extensive metal removal. As is the case with most transit systems, obtaining adequate track time to perform maintenance is a challenge. The typical maintenance window between the last and first trains of the day is three to 3.5 hours at Sound Transit. For more information, visit www.MassTransitmag.com/10066147 22 Mass Transit | MAY/JUNE 2023 2306MASS_Advanced Rail Management.indd 1 5/11/23 8:29 AMhttp://www.arm-corp.com http://www.MassTransitmag.com/10066147