This paper describes the cost and schedule trade-offs which were implicit in the decisions to perform major reconstruction of three different transit systems: the Frankford E1 in Philadelphia, which is being done under service; the reconstruction of the north main line of the Regional Rail Division in Philadelphia, done in two consecutive summer shutdowns; and the rehabilitation of the Lake Street/South Main Line of the Chicage Transit Authority, for which operations were totally suspended. The costs of inefficiencies and lost time associated with work under service are compared with the overtime and shift costs of the acceleration necessary to limit extended shutdown periods and the costs of providing alternative transportation.
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机译：本文描述了在进行三种不同交通系统的重大重建的决策中所隐含的成本和计划权衡：费城的Frankford E1，正在使用中;费城地区铁路分部北部干线的重建工作，已连续两次夏季停工;以及Chicage运输当局的Lake Street / South Main Line的修复工作已全部暂停。将效率低下的成本和与在职工作相关的浪费时间与限制加长停机时间所需的加速加班和班次成本以及提供替代运输的成本进行了比较。
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