THE GEOGRAPHY OF TRANSPORT SYSTEMS
The double-stacking of many rail corridors which took place in the 1980s and 1990s bought some time for rail operators as it provided additional capacity with essentially the same line infrastructures. A substantial wave of investment took place in recent years over strategic segments of the American rail system with the goal of improving the capacity and efficiency of long distance corridors. The improvements are multiple, namely better grades, double (or triple) tracking, new and improved intermodal terminals, but also better signal and management systems. A particular effort has also been made to better connect the rail infrastructure with major port facilities, notably with on-dock and near-dock rail terminals. Both the capacity and speed of rail operations have been improved. The most significant projects include:
Mostly because of gradient, there are energy consumption differences between long distance corridors. For instance, the Prince Rupert - Chicago corridor established by CN in 2007 has a notable fuel efficiency advantage over other west coast long distance intermodal corridors. While the Prince Rupert - Chicago corridor is of longer distance, it consumes 5.2 gallons per ton of cargo moved, while the Seattle - Chicago and Los Angeles - Chicago corridors consume respectively 6.6 and 6.0 gallons per ton of cargo moved.