While the Nile, Congo and Amazon Rivers are longer, from a commercial point of view all three together are minor river compared to the lower Mississippi (i.e St. Louis to New Orleans). The Interstate Highway System is Minor compared to the Lower Mississippi. The Upper Mississippi, the Missouri and Ohio River system (Along with other navigable rivers that flows into all three rivers) make up the single biggest water transportation system in the world. As you see, most rail lines connect to the east or west coasts and then to the Mississippi-Ohio-Missouri River system. Those barges (and the ships and barges on the related Great Lake Water System) provide the most serious competition to the big six railroads.
The US (and Canada, for we must count the Great lakes) have 8200 miles of Navigable inland waterways.
The Ohio and its Seven Navigable tributaries,
Allegheny River 69 Miles in Length from Pittsburgh to East Brady PA, see
http://www.lrp.usace.army.mil/navchart/al/terminal.pdf for details)
Cumberland River
Kanawha River
Monongahela River (Which includes a mile into the Youghiogheny River at McKeesport PA and ends with about a mile in the Tygart River and West Fork River in West Virginia south of Morgantown West Virginia, a total of 128.7 miles in length for Navigation see
http://www.lrp.usace.army.mil/navchart/mon/mile.pdf for details).
Tennessee River (Which connects also the the Tennessee-Tombigbee Waterway to Mobile Alabama, see
http://en.wikipedia.org/wiki/Tennessee_River for details)
Green River Ky (61 miles in length for Navigation. See
http://en.wikipedia.org/wiki/Green_River_(Kentucky) for Details)
Kentucky River (Only to Lock #4 in Frankfort Ky, Locks 5-14 are maintain for drinking supplies NOT navigation, see
http://en.wikipedia.org/wiki/Kentucky_River for details).
http://www.lrp.usace.army.mil/nav/nav.htm#chartshttp://crunch.tec.army.mil/enc/echarts/IENCShapeFileRequest.cfmhttp://www.iwr.usace.army.mil/ndc/navchart/navindexmap.htmThe Mississippi has a similar source of other Navigable rivers that flow into it (and the Missouri), together most of the 8200 miles of navigable rivers is in this complex (The Great Lakes is #2, through no navigable rivers flow into the Great Lakes with the exception of the Chicago River which at one time did flow into the Great Lakes but in the late 1800s was reversed to flow into the Mississippi River AND the rivers the interconnect the Great Lakes themselves). While a distant #2 compared to the Mississippi River System, the Great Lakes Systems is one of the largest in the world (if not #2 to the Mississippi). The Amazon, the Nile, the Indus, the Ganges, the Yangtze, the Yellow and the Volga/Don/Northern Dvina (The heart of Russia) River systems are all similar in navigation to the Mississippi/Missouri/Ohio and Great lakes River systems River Navigation system. In many ways the Great Lakes is either as larger or larger then the above named river systems but it is clearly second to the Mississippi/Missouri/Ohio River system that is how large and important the Mississippi/Missouri/Ohio river system is (and connections between the two is easier then the Great Canal the Chinese built to connect the Yangtze and the Yellow Rivers, and is as easy as the Don-Volga Canal connecting those two rivers).
Yes, I did not mention the Rhine or the Danube. Both are better known then the above rivers for their are in Europe, but both are independent of each other from a navigation point of view AND smaller then any of the above named river systems. My Comment is the Railroads of North America are more often connecting the East Coast or West Coast to the Mississippi/Missouri/Ohio River system more then doing anything else (unlike Europe which has the greatest coast line of any continent, and for that reason tend to use the surrounding seas like we use the Great Lakes and the Mississippi/Missouri/Ohio River System).
My point is this purchase is part of HOW we ship goods around. In Europe most rail service is passenger for shipping by sea is often easier and quicker. In North America most rail service is freight as we connect the East Coast and West Coast to the Mississippi/Missouri/Ohio River system. Do to this greater dependence on Freight Railroads we have to be careful about HOW these railroads are controlled. I am not saying we should stop this transaction but do we want competition or regulation (or government ownership of the Railroads)? Once that question is decided (and the decision at the present time is competition) does this enhance competition? If yes, we should support the take over, if no we should oppose it.