On May 23, the Carrier responded, arguing that Gang M4950 in fact is being scheduled as part of a legitimate seven-day operation, and that it is immaterial that it does not share a headquarters with its mirror gang as they do share the same territory, functions, and tour of duty. The Carrier further argues that material changes to the language of Rule 36 over the years renders inapposite the precedent on which the Organization principally relies, and permits the Carrier to establish Gang M4950 as part of a seven-day operation. As such, the Carrier argues that PEB 222 also is inapposite, as this case, unlike that earlier case, involves a seven-day operation. Additionally, the Carrier details, the provisions of PRIIA and changing operational limitations and needs that require a finding that operational necessity undergirds its action in establishing Gang M4950 as part of a seven-day operation, including its need to rely on planned 55-hour preventive maintenance outages over the weekends as well as an overall increase in the infrastructure burdens relating to increased ridership. By way of further support, the Carrier points to Engineering reviews it conducted in the wake of PRIIA, which confirm that due to increased traffic loads over the typically long operating schedule in the New York Division, a lengthened a tour of duty provided by a 4x10 workweek would be of negligible value. Essentially, the Carrier maintains, unplanned outages and resulting passenger delays are becoming more frequent and serve to underscore the need for an increased focus on preventative maintenance over the weekends. Since the change to a seven-day operation, the Carrier states, there has been a significant decrease in the number of delay minutes as a result of weekend maintenance coverage. As the Carrier puts it, "This improvement is attributed to the presence of these gangs on site during weekend shifts, on a regular basis, to perform routine maintenance and provide more effective and efficient
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