... destinations because of rules limiting the number of hours they could work. Because locomotives and cars sat idle on sidings, they were unavailable to move the freight stacking up at rail yards around ... maintenance, and theseTable 2.5Annual Expenditures on Maintenance and InfrastructureYearWay and Structure Expenditures (2006 $) Miles of TrackWay and Structure Expenditures per Mile1955 10,266,420 ... number of parallel tracks and the slope of the terrain, that influence operations and the amount of freight that can be carried over a particular track segment. All of this infrastructure must...