铁路也提供了数以千计的新工作：制造车厢、运营铁路和维修铁轨。
The railways also provided thousands of new jobs: building carriages, running the railways and repairing the tracks.
频率和成本高，这导致一些运营商不愿意将这一维修工作在所需的频率。
The frequency and high cost of this has led to reluctance by some operators to have this maintenance done at the required frequency.
在总结轨道交通网络运营的概念和基本特征的基础上，阐述了上海轨道交通网络化的管理体制、运营组织方式以及维修模式。
With a summary of the concept and basic features of UMT network, this paper discusses the managerial system, operation organization mode and service mode on Shanghai UMT network.
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