The vast consolidation within the rail industry means that most shippers are served by only one rail company.
主干：The vast consolidation means that
宾语从句：that most shippers are served by only one rail company. that引导的宾语从句做means的宾语。
介词短语做后置定语：within the 
rail industry，介词短语做后置定语修饰consolidation。
翻译：铁路运输业的大规模联合意味着多数客户将会依赖一家公司的服务。
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