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Railroad ties are wooden, as in "they wooden dissipate much heat!".

 

Seriously.  Wood is a poor heat sink.  Even a section of rail itself wouldn't be all that good, and really inefficient.  You need lots of surface area (a heat sink, as Robb suggested) and lots of air - or oil - or some other non-electrically-conductive medium to conduct the heat away from the heat sink.

 

Visit your local electrical utility.  You can usually get a gallon or two of never-been-used transformer oil for the cost of a dozen donuts.