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Car float
Unpowered barge with railroad tracks mounted on its deck / From Wikipedia, the free encyclopedia
A railroad car float or rail barge is a specialised form of lighter[1] with railway tracks mounted on its deck used to move rolling stock across water obstacles, or to locations they could not otherwise go. An unpowered barge, it is towed by a tugboat or pushed by a towboat.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/6/65/NYH_carfloat.jpg/320px-NYH_carfloat.jpg)
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This is distinguished from a train ferry, which is self-powered.