Building big

摘要

Many railroads are spending record levels on mainte-nance-of-way projects this year, with major bridge projects landing high on their list of priorities. In some cases, the work is necessary as part of broader plans to maintain states of good repair; in others, to replace worn-out bridges so new ones can handle heavier loads and faster trains. Some structures are being built for special purposes, too: Alaska Railroad Corp. is constructing a bridge over the Tanana River that will improve U.S. military access to important training facilities; and Norfolk Southern Railway's 2012 projects included modifying two bridges to accommodate tall and wide equipment for two utility plants.