President Barack Obama's high-speed rail initiative is facing political and logistical challenges. In some states -- including Wisconsin, Florida and Ohio -- Republican candidates for governor are trying to bail out of the project. Meanwhile, freight rail companies are raising concerns about rail capacity as they work to negotiate high-speed rail agreements with the states. They emphasize that preserving the nation's freight rail system is chief among their concerns and that these agreements are not necessarily a win-win for all parties involved.

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