①The vast consolidation within the rail industry means that most shippers are served by only one rail company.

　　②Railroads typically charge such “captive” shippers 20 to 30 percent more than they do when another railroad is competing for the business.

　　③Shippers who feel they are being overcharged have the right to appeal to the federal government’s Surface Transportation Board for rate relief, but the process is expensive, time-consuming, and will work only in truly extreme cases.

　　①(总)铁路行业的大规模整合意味着，大多数托运人只能得到一家铁路公司的服务。

　　②(并列)铁路公司通常会向这些“受控制的”客户收取20%到30%的费用，这比其他铁路公司竞争业务时要多。

　　③(并列)觉得要价过高的托运人有权向联邦政府的地面运输委员会上诉，要求减少运费，但这个过程既昂贵又耗时，而且只在真正极端的情况下才会奏效。