The parties have addressed the need for seasonal track maintenance, and large gangs to accomplish that work, in their agreement, specifically in Rule 19. In interpreting collective bargaining agreements, it is important to look not only at individual provisions but also at the entire agreement, in order to understand the context for those individual provisions. In addition, the parties' conduct over the years gives insight into their mutual interpretation of the language and provisions of their agreement. In this case, the Carrier has retained the right to establish positions and to abolish them when they are no longer needed. It does not have the right unilaterally to assign employees in permanent positions to the seasonal production gangs. Overall, the agreement focuses on permanent, or district-based, employment. For instance, Rules 3.6 and 3.7, relating to the advertisement and award of open positions, refer to headquarters location in position announcements and for posting purposes. Rule 19, then, is an exception to the normal district-based employment addressed in the agreement as a whole. Moreover, the record is that the parties have treated it as such in the past. The language of Rule 19 itself recognizes the parallel existence of regular jobs in the different seniority territories through whose geographic boundaries the interdivisional gangs will work. Rule 19.9 limits employees called back from furlough under Rule
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